Brooks Nader‘s newest photoshoot is probably more appropriate for Playboy than Sports Illustrated’s Swimsuit issue … ’cause she ditched the bikini for an au naturale look on vacay.

The model ran off to Los Cabos, Mexico for a little Valentine’s vacation … and, she decided to really let loose — throwing off her top and letting it all hang out.

Check out the pics … Brooks starts with a bright orange top on while her topless gal pal photographs her — but, she quickly decides to get as naked as her proverbial dancing partner and frees the nipple for the whole beach to see.

She didn’t win the Mirrorball trophy this year … but, she’s certainly brought her own disco balls to the beach — and, she didn’t cover up when she took a phone call at the resort.

Worth noting … Brooks was spotted with a girlfriend and was lying next to a man in a beach chair — unclear how well they know each other — but, her “Dancing with the Stars” partner Gleb Savchenko didn’t go on vacation with her.

We caught up with the on-again, off-again couple back in December … and, they confirmed they were involved — though they admitted they weren’t engaged.

Now, it’s unclear what the status of their relationship is … but, clearly GS didn’t get an eyeful — or handful — on vacation.