and sister Ashlee Simpson
pose together at the Wet Republic pool at the MGM Grand Hotel/Casino to celebrate Ashlee
's 25th birthday on Saturday (October 3) in Las Vegas, Nevada.
The 29-year-old singer's dad, Joe Simpson
, recently spoke out about the weight criticism Jessica
received earlier this year. "She's always scrutinized by the world and [it's great] to watch her go to other countries