Fergie Has Definitely Been Working On Her Fitness

Fergie's lady lumps are in check!

The Black Eyed Peas singer hit the beaches of Cancun, Mexico showing off her sexy body in a two-piece suit. As Martin Lawrence would say ... Damn, Gina!

Fergie, 37, has been vacationing with hubby Josh Duhamel, 39, south of the border.

As for her fitness regime, the sexy songstress recently told Rachael Ray:

"I work out four times a week," she said. "I get bored, so like I hike outside and I walk uphill to squeeze those glutes, put on music, jump rope -- with a double sports bra! A double sports bra is key for the jump rope."

'Nuff said.