Jaime Pressly works hard in the gym, and the 34-year-old actress is proud to show off the sexy results!

The My Name Is Earl starlet Tweeted these photos while on vacation in Cancun, Mexico ... and wow, working out certainly does a body good!

Pressly, who stars on Fox's I Hate My Teenage Daughter, is now dating Hamzi Hijazi. She filed for divorce from lawyer Simran Singh back in January.