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Celebrating in style,  Ashlee Simpson rang in her 25th birthday at the Wet Republic pool at the MGM Grand Hotel/Casino in Las Vegas on Saturday afternoon (October 3).

Joined by hubby Pete Wentz and sister Jessica Simpson, the trio had an action-packed day at the Sin City hot spot – posing for pictures before taking to the pool for a little fun in the sun.

Aside from spending time working on her new “Melrose Place” gig, Ashlee recently voiced her desire to give son Bronx a brother or sister in the future.

She tells, “Oh gosh-we definitely want a big family. We’re young-we’ll see. I would love to have a big family and I know Pete would, too.”