The singer shared one smokin' hot swimsuit photo from her family vacation on Tuesday night, flaunting some crazy cleavage with a white one-piece, oversized sunnies, messy hair and white heels.
While she captioned the shot "Vacation Vibes," the blonde beauty was giving everyone else Pamela Anderson vibes with her killer curves and seductive pose.
Almost immediately, the comments section of Instagram was flooded with comparisons to the '90s stunner -- with people leaving messages like "Totally thought this was a throwback of Pam Anderson" and "So thought u were Pam Anderson here!"
Simpson has been showing off her slim physique all over Instagram lately, sharing another photo from her trip over the weekend where her totally toned gams stole the show.
Wearing a short black coverup and black swimsuit, we couldn't keep our eyes off those legs -- someone's clearly been hitting the gym on a regular basis!
The singer is celebrating her 35th birthday in St. Bart's, where she was also joined by her two adorable children with Eric Johnson, Maxwell and Ace.
Jess posted a cute snap of the couple's kiddos on Tuesday as well, showing the two splashing around in the water while on vacay.