@lisarinna / Instagram 1 / 10
@lisarinna / Instagram 1 / 10

Has Lisa Rinna discovered the fountain of youth?

The "Real Housewives of Beverly Hills" star has been on vacation in Mexico, posting bikini photo after bikini photo. She looks absolutely incredible, and she knows it.

"Is it too much? Enough already?" she asked after posting one photo on March 30. "I'm 51."

RELATED: Hottest bikini bodies: 40 and over

Lisa and her family are in Mexico celebrating her and husband Harry Hamlin's 18th anniversary. She even posted a few throwback photos from their wedding day in 1997. But, really, her in-shape body is the star of her Instagram.

RELATED: Stars who reversed bad plastic surgery

Oddly enough, on March 25, Lisa posted a photo of herself from when she participated on Season 2 of "Dancing With The Stars." According to her caption, she longs to have that 2006 body again. "Seriously look at this dwts body?!," she wrote. "It was so f------ good wasn't it?! Holy hell. I miss that body!"

RELATED: Celebs in grapefruit colors

Rest assured, Lisa, because your 2015 body is still equally as impressive. 
Mamma's got it going on!