They look smitten!

Jennie Garth celebrated her 43rd birthday at the Dreams Tulum Resort & Spa in Mexico on Monday, and the actress was the picture of happiness as she basked in the sun with her beau. Her ex Peter Facinelli just got engaged to girlfriend Jamie Alexander, but the 90210 star doesn't seem bothered by that at all!

The couple were joined by the blonde beauty's three daughters, and the whole group enjoyed the beach, boogie boarding, spending time at the spa, shopping in the city of Tulum, getting hemp tattoos, and celebrating the TV star's birthday with a private dinner on the sand.

The pair have been dating since December, and it seems pretty serious!