This is getting SERIOUS! Delilah Belle Hamlin was first spotted with Love Island hottie Eyal Booker at Coachella a few weeks back by eagle-eyed fans and since then, the two have been inseparable! Even on Mother's Day, the 20-year-old model had her 23-year-old reality show beau tag along for brunch with mommy Lisa Rinna at Nobu Malibu. Rinna's such a good sport, we imagine she didn't care one bit that it wasn't just her and her girls alone for the day.

Amelia, 17, sported a wacky white onesie jumpsuit with matching bucket hat and dad sneakers, while mom Lisa wore a casual-cool black-and-white look. It's hard to believe the Real Housewives of Beverly Hills star is 55 -- she looks AMAZING!

No wonder she spawned such cute daughters with equally-sexy hubby Harry Hamlin -- Delilah's and Amelia's modeling careers have really taken off. And little Miss Delilah Belle seems like she's poised to be a headline-grabbing star with her high-profile dating and with outfits like THIS!