Lady Gaga Birthday - LEAD
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Ain’t no party like a Saint Laurent-clad one!

To celebrate her birthday in true style, Lady Gaga, who turned 30 today, hosted a party inside L.A.’s No Name club Saturday night. The former American Horror Story: Hotel star turned to a gilded, '80s-inspired Hedi Slimane creation for the celebrity-packed affair, which she attended with hunky fiancé Taylor Kinney (who wore a casual jeans-and-blazer getup). A bold red lip, elegantly styled 'do, glitzy Lorraine Schwartz necklace, and sky-high platforms completed Gaga's ultra-glam ensemble.

But don’t think the bash was just about the birthday girl: As if one chart-topping musician wasn't enough, the "Born This Way" singer welcomed Taylor Swift, Lorde, Nick Jonas, John Legend, Lana del Rey, and Kylie Minogue as guests, People reports.

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It appears that the dress code called for dress-to-the-nines ensembles. Swift, who has previously expressed her love for Gaga, rocked a '70s-like black sequined jumpsuit with black pumps.

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For Kate Hudson, the showdown called for a deep-V, sheer dress with a matching cape-like topper that proved the Almost Famous star's ability to mix sexy with bold.

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Meanwhile, “Levels” singer Jonas, among the most dapper of men, opted for a black-tie get up and a too-handsome smile.

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There was also no way of stopping mom-to-be Chrissy Teigen from sharing the spotlight. The Cravings cookbook author proudly showcased her growing baby bump—moms know how to party, too—and rocked an all-black look while hubby Legend followed suit in a casual dark-toned getup.

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Talk about the party of the weekend!