Maria Menounos, Jessica Alba
Credit: Joe Scarnici/WireImage

A pregnant Jessica Alba joined Maria Menounos at Shay Todd in Los Angeles to celebrate the Access Hollywood and NBC News correspondent's new book, The EveryGirl's Guide to Life. Alba showed off her pregnant belly in a L.A.M.B. maxi dress topped with a Burberry leather vest and Paige Novick necklace, while Menounos shined in a gold sequined jacket and Tacori diamond studs. Later that night, Britney Spears made a surprise appearance at Nicki Minaj's after concert party at The Factory nightclub in West Hollywood. See more photos from the weekend’s hottest parties in the gallery!