Eva Mendes, Kim Kardashian

Reebok; Sketchers

Watch out, Kim Kardashian, you've got some fierce competition!

Just months after the Kourtney & Kim Take New York star became the butt face of Skechers' fitness footwear, rival brand Reebok signed on sexy actress Eva Mendes!

The ads debuted this week, in which Eva lounges by a pool in her workout wear looking sporty yet oh-so-sultry.

"Between long days on the set and travel, it's not always possible to get a full workout in, so I have to make the time I have count," the Latina star says in a statement. "As an actress, being fit is important, and EasyTone is my great secret!"

So both ladies are working it big-time, but which one's got you sold: bootylicious Kim or toned Eva?

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