Black Eyed Peas singer Fergie, 38, posted a photo of herself on Twitter wearing a colourful print dress and holding a "Say my name" clutch bag, suggesting that her son's name was the subject of discussion at the party.
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The party, which was held at the SLS Hotel in Beverly Hills, was dubbed a "gayby shower" by Fergie in honour of her gay best friends, her agent Sean Patterson, designers Dean and Dan Caten and hairstylist Andy LeCompte, who hosted the bash. Entertainment was provided by a troupe of burlesque drag performers.
According to People magazine, the theme of the celebration was black, white and blue as the celebrity couple recently announced they are expecting a baby boy in September.
A four-tiered cake decorated with a giant teddy bear and the word "baby" was the centre-piece for the party, while guests sipped on Fergie-inspired cocktails such as "Ferg-aritas" and "The Hot Mamma".
"Woo! It's my baby boy's first party!" said the expectant star, as she addressed guests through a microphone.
Celebrity blogger Perez Hilton also attended the event, calling it "the most fabulous event ever thrown by the most fabulous mommy-to-be ever" . He took his son Mario to the bash and later posted a picture of his lookalike baby on Instagram.
Newly engaged presenter Kelly Osbourne attended the baby shower with her fiancé Matthew Mosshart and posted several pictures throughout the day.
Fergie, who married Safe Haven star Josh in 2009, is applying to legally change her name from Stacy Ann Ferguson to Fergie Duhamel before their baby is born.
Fergie isn't the only expantant mother in her family, as last week she revealed that her younger sister Dana is also pregnant.
"I am BEYOND excited my lil sis is pregs!!!!!" she wrote on Twitter. Her sister had tweeted, "13 weeks! So excited 2 be a mommy!"