The horses weren't the only ones with thoroughbred legs in Surrey, UK, this weekend: Mischa Barton showed off her winning pair in a mirror-embellished Louis Vuitton dress and a pair of high, high heels at the Cartier International Polo match.
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The Simpson girls aired their differences during a sisterly meal at the Ivy in L.A. Jessica wore a glamorous Rozae Nichols dress that she accessorized with a Fendi bag and shoes by Azzedine Alaïa. Ashlee topped off a pair of Lanvin boots with a fashion-forward Katy Rodriquez pinafore dress and a Marc Jacobs purse.
Souza-Jess/X17
Nicky Hilton channeled a Greek goddess while attending the L.A. launch of Very Sexy makeup by Victoria's Secret. The designer wore a simple white tunic with gladiator sandals and a silvery shoulder bag.
John Sciulli/WireImage
Chloë Sevigny in a printed bubble dress from Myself by Kai Kühne. The actress attended a celebration for the 100th episode of The Best Week Ever on VH1.
Dimitrios Kambouris/WireImage
Maria Bello gave the classic tuxedo a seductive new spin in a menswear-inspired outfit by MaxMara. The actress was in New York City for the premiere of World Trade Center.
Jim Spellman/WireImage
Rachel Bilson looked kissable in a bubble dress by Brian Reyes accented with a lipstick-red belt and a pair of vintage pumps. The actress was attending a listening party for the soundtrack to her upcoming movie, The Last Kiss.
Todd Williamson/FilmMagic
Vanessa Minnillo was sexy in the city as she took a stroll around Manhattan in an off-the-shoulder C&C California top and a pair of denim short-shorts by Anlo. She accessorized her casual look with a pair of Gucci sunglasses and a Dior "Gaucho" bag.
Dara Kushner/FilmMagic
Christina Milian stopped traffic in a siren-red Louis Verdad shirtdress. The singer/actress wore the '40s-inspired satin frock on a visit to MTV's TRL.
Humberto Carreno/Startraks
Elisha Cuthbert looked fierce on the New York City sidewalks in a leopard-print shirtdress cinched at the waist with a two-tone sash. The actress was in Manhattan to promote her new film, The Quiet.
Roger Wong/INF Goff
Paris Hilton sauntered down a Beverly Hills street in a chiffon shirt by Nanette Lepore and a Miss Sixty skirt. She finished off the look with a vintage suede belt, shoes by Betsey Johnson and a Prada purse.
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Jessica Biel stood tall in a Catherine Malandrino dress and towering platform sandals. The actress was attending a preview of her latest movie, The Illusionist, held by The Cinema Society in Southampton, New York.
Tana Lee Alves/WireImage
Hilary Duff revealed her dark side in a midnight-hued Empire-waist dress by Yves Saint Laurent. The actress/singer was in New York City for the première of her new movie Material Girls.
Kevin Mazur/WireImage
Jessica Biel was a lady in white at the Yari Film Group première of The Illusionist held at Chelsea West Cinemas in New York City. The actress wore a Guy Laroche gown and carried a clutch by Fendi.
Peter Kramer/Getty
Gwyneth Paltrow was golden outside of Madonna's birthday party in a sheer tie-front shirt and cropped pants. She accessorized the look with a brown leather belt, slingbacks and a clutch bag.
News International/WireImage
Sarah Jessica Parker was the belle of Broadway in an ivory fifties-style sheath by Peter Soronen, shoes by Christian Louboutin and a Fred Leighton bird brooch. She was attending the première of Martin Short's new musical, Fame Becomes Me.
Jennifer Mitchell/Splash News
Rachel Bilson was a style role model at the Teen Choice Awards. The petite actress was perfection in a Zac Posen "Yacht" dress from his 2006 Resort collection and pointy-toe pumps from Prada.
Frank Micelotta/Getty
Charlize Theron was luminous in lace at the Edinburgh International Film Festival's 60th-anniversary party. She lit up the Scottish night in a Guy Laroche frock, Stella McCartney shoes and a Christian Louboutin clutch.
Jeff Mitchell/Getty
Penélope Cruz was a regal presence at the Ambassador Theatre in New York City, wearing an asymmetrical lace dress from Chanel and a coronet of braids. The Spanish actress was attending the Broadway début of Usher Raymond in Chicago.
Evan Agostini/Getty
Elizabeth Banks brought Old Hollywood glamour to Manhattan in her Dolce & Gabbana corset dress worn with Jimmy Choo shoes and jewelry from Martin Katz. The actress was attending the première of her new movie Invincible.
Jim Spellman/WireImage
Kyra Sedgwick was ethereal at the Emmys in a cloud-like gown from Giorgio Armani Privé. The star of The Closer kept the look playful with her long, loose waves.
Kevin Winter/Getty
Jaime King was crowned with gold at an Emmy after-party hosted by TV Guide. Her blond Veronica Lake-curls reflected well on her empire-waist Georges Chakra couture gown and Jimmy Choo shoes.
Frederick M. Brown/Getty
Jessica Simpson brought flower power to Manhattan in a Missoni minidress. She accessorized the retro look with Michael Kors McGraw boots and a Chloé handbag.
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Scarlett Johansson wore a soft, seventies look to a photo call for the Venice Film Festival première of Black Dahlia. The actress complemented her loose Farrah Fawcett waves with a Missoni top and satin shorts from Margaret 
's.
's.George Pimentel/WireImage
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Mischa Barton
The horses weren't the only ones with thoroughbred legs in Surrey, UK, this weekend: Mischa Barton showed off her winning pair in a mirror-embellished Louis Vuitton dress and a pair of high, high heels at the Cartier International Polo match.
Advertisement
Jessica and Ashlee Simpson
The Simpson girls aired their differences during a sisterly meal at the Ivy in L.A. Jessica wore a glamorous Rozae Nichols dress that she accessorized with a Fendi bag and shoes by Azzedine Alaïa. Ashlee topped off a pair of Lanvin boots with a fashion-forward Katy Rodriquez pinafore dress and a Marc Jacobs purse.
Nicky Hilton
Nicky Hilton channeled a Greek goddess while attending the L.A. launch of Very Sexy makeup by Victoria's Secret. The designer wore a simple white tunic with gladiator sandals and a silvery shoulder bag.
Advertisement
Chloë Sevigny
Chloë Sevigny in a printed bubble dress from Myself by Kai Kühne. The actress attended a celebration for the 100th episode of The Best Week Ever on VH1.
Advertisement
Maria Bello
Maria Bello gave the classic tuxedo a seductive new spin in a menswear-inspired outfit by MaxMara. The actress was in New York City for the premiere of World Trade Center.
Advertisement
Rachel Bilson
Rachel Bilson looked kissable in a bubble dress by Brian Reyes accented with a lipstick-red belt and a pair of vintage pumps. The actress was attending a listening party for the soundtrack to her upcoming movie, The Last Kiss.
Advertisement
Vanessa Minnillo
Vanessa Minnillo was sexy in the city as she took a stroll around Manhattan in an off-the-shoulder C&C California top and a pair of denim short-shorts by Anlo. She accessorized her casual look with a pair of Gucci sunglasses and a Dior "Gaucho" bag.
Advertisement
Christina Milian
Christina Milian stopped traffic in a siren-red Louis Verdad shirtdress. The singer/actress wore the '40s-inspired satin frock on a visit to MTV's TRL.
Advertisement
Elisha Cuthbert
Elisha Cuthbert looked fierce on the New York City sidewalks in a leopard-print shirtdress cinched at the waist with a two-tone sash. The actress was in Manhattan to promote her new film, The Quiet.
Advertisement
Paris Hilton
Paris Hilton sauntered down a Beverly Hills street in a chiffon shirt by Nanette Lepore and a Miss Sixty skirt. She finished off the look with a vintage suede belt, shoes by Betsey Johnson and a Prada purse.
Advertisement
Jessica Biel
Jessica Biel stood tall in a Catherine Malandrino dress and towering platform sandals. The actress was attending a preview of her latest movie, The Illusionist, held by The Cinema Society in Southampton, New York.
Advertisement
Hilary Duff
Hilary Duff revealed her dark side in a midnight-hued Empire-waist dress by Yves Saint Laurent. The actress/singer was in New York City for the première of her new movie Material Girls.
Advertisement
Jessica Biel
Jessica Biel was a lady in white at the Yari Film Group première of The Illusionist held at Chelsea West Cinemas in New York City. The actress wore a Guy Laroche gown and carried a clutch by Fendi.
Advertisement
Gwyneth Paltrow
Gwyneth Paltrow was golden outside of Madonna's birthday party in a sheer tie-front shirt and cropped pants. She accessorized the look with a brown leather belt, slingbacks and a clutch bag.
Advertisement
Sarah Jessica Parker
Sarah Jessica Parker was the belle of Broadway in an ivory fifties-style sheath by Peter Soronen, shoes by Christian Louboutin and a Fred Leighton bird brooch. She was attending the première of Martin Short's new musical, Fame Becomes Me.
Advertisement
Rachel Bilson
Rachel Bilson was a style role model at the Teen Choice Awards. The petite actress was perfection in a Zac Posen "Yacht" dress from his 2006 Resort collection and pointy-toe pumps from Prada.
Advertisement
Charlize Theron
Charlize Theron was luminous in lace at the Edinburgh International Film Festival's 60th-anniversary party. She lit up the Scottish night in a Guy Laroche frock, Stella McCartney shoes and a Christian Louboutin clutch.
Advertisement
Penélope Cruz
Penélope Cruz was a regal presence at the Ambassador Theatre in New York City, wearing an asymmetrical lace dress from Chanel and a coronet of braids. The Spanish actress was attending the Broadway début of Usher Raymond in Chicago.
Advertisement
Elizabeth Banks
Elizabeth Banks brought Old Hollywood glamour to Manhattan in her Dolce & Gabbana corset dress worn with Jimmy Choo shoes and jewelry from Martin Katz. The actress was attending the première of her new movie Invincible.
Advertisement
Kyra Sedgwick
Kyra Sedgwick was ethereal at the Emmys in a cloud-like gown from Giorgio Armani Privé. The star of The Closer kept the look playful with her long, loose waves.
Advertisement
Jaime King
Jaime King was crowned with gold at an Emmy after-party hosted by TV Guide. Her blond Veronica Lake-curls reflected well on her empire-waist Georges Chakra couture gown and Jimmy Choo shoes.
Advertisement
Jessica Simpson
Jessica Simpson brought flower power to Manhattan in a Missoni minidress. She accessorized the retro look with Michael Kors McGraw boots and a Chloé handbag.
Advertisement
