Lisa Rinna is flaunting her bikini body again. However, the 54-year-old actress isn’t just strutting around in a skimpy swimsuit to show off her tiny waistline and toned physique; she’s doing it to help her Real Housewives Of Beverly Hills costar Dorit Kemsley promote her new beachwear line, Beverly Beach by Dorit.\nOn Friday, Rinna took to Instagram to prove that purveyors of swimwear don’t need to hire models in their 20’s to sell bikinis. In the mirror selfie that she shared with her followers, Rinna is rocking a black strapless bikini with low-cut bottoms. The top features knot detailing and a cutout strategically placed between the breasts, or a “cleavage window.”\nRinna accessorized her bikini with a floppy black hat and a pair of over-sized shades. She didn’t share any details about her swimsuit with her followers, simply captioning her photo with a taco emoji and the word “OLÈ.”\nHer two-piece is from the Beverly Beach by Dorit swimsuit line, and the Instagram account for the brand turned Rinna’s selfie into an ad by re-posting it. As reported by 2Paragraphs, Dorit Kemsley said that she has named some of her bikinis after her Real Housewives of Beverly Hills costars. However, the bikini Lisa Rinna is rocking in the snapshot below is called the “Amanda.”\n“WHAT A BABE @lisarinna looking hot af in the Amanda bikini #beverlybeachbabe #bodygoals #slay #yaasss,” read the post on the beachwear brand’s Instagram page.\n\n\n\n\n\n OLE’ ????\nA post shared by Lisa Rinna (@lisarinna) on Apr 20, 2018 at 7:23pm PDT\n\n\n\nFor the record, the “Lisa” is also a black two-piece. However, it features a classic string bikini design with bottoms that tie on the sides and a top with halter straps.\nDuring a recent interview with Entertainment Tonight, Kemsley chatted about her new beachwear line, which recently got plenty of free publicity when its launch was turned into a Real Housewives Of Beverly Hills storyline. As reported by Entertainment Weekly, some major drama went down at the launch party, and the end result of an argument about heads being chopped off in pictures and another rehashing of “panty-gate,” with Kyle Richards storming out of the event. Luckily, Dorit did not go into the bikini business with any of her female castmates. Instead, she’s working with her husband, PK.\n“I’m so grateful to have his expertise and his advice, and to have his shoulder,” Dorit said. “I think it works. I love having him a part of the business. I did it for many years without him, and I was successful at it, so it’s not a matter of whether I can or cannot do it. I just feel like it’s just better having him along for the ride.”\n\n\n\n\n\n So incredibly proud of all my girls that walked my #BeverlyBeachbyDorit fashion show! ???????????? you killed it- thank you!!! And another special thanks to @trunkclub in Culver City for the fabulous event space, it couldn’t have been better! @corymartinevents and @kevinvanegas THANK YOU for ALWAYS pulling off the most magical and incredible events with me and for NEVER disappointing me when I ask for the world! You are my event planners for life! Love you guys! #corymartinevents #rhobh #bravo thank you for an incredible season finale and for the support in Beverly beach I’m so beyond grateful! ????????????????❤️????\nA post shared by Dorit Kemsley (@doritkemsley) on Apr 18, 2018 at 7:11am PDT\n\n\n\nThe three-part Real Housewives Of Beverly Hills reunion special begins airing Tuesday, April 24, at 9 p.m. ET on Bravo.