Lais Ribeiro

Even celebs need a calm, relaxing reset every now and then ... and we've got a gallery of stars sweating it out in saunas! Here's lovely ladies like Lais Ribeiro and Nathalie Emmanuel showing off their flawless physiques while getting all steamy ... and look at Salma Hayek, who's just relaxing as…

Joakim Noah's model girlfriend Lais Ribeiro was so damn hot in her thong bikini in Malibu this weekend -- we barely noticed the beach was littered with a ton of HUGE stars!! Seriously ... everyone from John McEnroe to Kenny Chesney and Cindy Crawford and Rande Gerber were hanging out at…