It's a battle of the Over 40 beach bods!
Former "Melrose Place" costars Heather Locklear and Lisa Rinna both put their toned tummies on display over the long weekend -- where they proved age ain't nothing but a number.
The 51-year-old Locklear looked amazing in a white bikini top and matching skirt on the beaches of Hawaii, looking happy and healthy as she flaunted some impressive cleavage.
Rinna, 49, was looking pretty great herself as she posed for a professional photographer at a pool party in Beverly Hills.
Yes, they both look AMAZING.
But, we just have to ask:
Check out how the rest of the cast of the show has aged through the years in the gallery above!