0811_jessica_launch - Copy
Jessica Simpson's
proud of her body!

The mother-of-two posted a new swimsuit photo to her Instagram account on Monday, rocking a black one-piece bathing suit, tan wedges and a flower crown.

The blonde beauty looked gorgeous as she posed next to a swimming pool with her pal. "Oh yea girl...We are proud to be in our bathing suits!! @baylormcg #hardworkpaysoff #workoutpartnersforlife," she captioned the sexy snap.

PHOTOS: Jessica Simpson Looks Skinner Than Ever in Short Shorts!

Simpson spent the day by the pool to celebrate what looks like sister Ashlee Simpson's bachelorette party, and posted a group shot of all the ladies at the bash.

0811_jessica_inset - Copy
"All the beauties celebrating @ashleesimpsonofficial / @missbananahammock!!! I love you Ash :)," she captioned the group snap.

PHOTOS: Ashlee Simpson & Evan Ross Engaged -- See the Ring!

It definitely looked like all of the attendees had a ton of fun -- what do you think about Jess' latest swimsuit pic?

Tell toofab in the comment section below and click "Launch Gallery" above to see even more celebrity beach bods!