Fergie has celebrated her baby shower in a star-studded party in L.A.

The singer, who is due in September, took over the SLS with friends – including Kelly Osbourne, Julianne Hough, Molly Sims, Ru Paul, Adam Lambert, Lance Bass and Halle Berry’s ex, Gabriel Aubrey – with Fergie welcoming guests by announcing “it’s my baby boy’s first party!”

Fashion Police’s George Kotsiopoulos tweeted this adorable photo with Fergie and co-star Osbourne, calling it the ‘best #GaybyShower ever!!!’

Hubbie Josh Duhamel was also in attendance, enjoying Ferg-aritas with guests and his wife’s own-label Ferguson Crest wine. Burlesque drag performers entertained guests, who also enjoyed a four-tied cake designed with the black, white and blue theme in mind, with one layer being decorated in baby blocks spelling out BABY, with a teddy bear on top.

Younger guests at the baby shower were entertained with teal and clear balloon animals, and everyone took home blue and white sweets.

Earlier this month, Duhamel, 40, announced he was preparing a push present for Fergie, 38 (real name Stacey Ann Ferguson), around the time that she took his last name, legally changing her name. The couple married in 2009.

Duhamel is excited at being a hands-on dad, saying they’ll make their schedules work to make sure they’re around for their little boy.

“I can’t imagine having a kid and then not being able to be there – that would just drive me crazy. My head would be at home with mom and baby,”he explained.

“We want to work it out so that we can be together; whether I am working, they can come with [me] or if she is working I can go with them. I can’t see myself ever wanting to be away from my wife and kid.”