Delilah Belle Hamlin has walked the runway for Alice + Olivia, Dolce & Gabbana, and now for a hot new swimwear brand called Delilah & Lisa. OK, so we made that last brand up. But when you see the newly minted 21-year-old posing on the beach with her mama Lisa Rinna, we think you'll agree that the mother-daughter pair serves up some fierce beach style. Who knows? Maybe a collaborative swimwear line will be in their futures. But for now, they're too busy celebrating on the beach. 

Delilah just had a big birthday, and she headed to Los Cabos to ring in her 21st year. (She even had a cake emblazoned with an image from her Boohoo campaign.) The model brought a group of pals with her on the beach vacation, and her loving family also showed up to party as well. As usual, the Rinna-Hamlin clan showed up in style, even for a casual jaunt to the beach. 

While Delilah opted for a neon green, one-piece suit, her mother flashed her abs in a teeny, sage-green bikini. Both Beverly Hills ladies tossed in a few accessories: For mom, it was a floppy hat and oversize sunglasses, while her mini-me opted for layered shell necklaces. 

Keep scrolling to take in the mother-daughter style, and to take a closer peek at Delilah's sizzling neon look. 

Photo: Ella Angel/ Instagram