Christina Applegate Rocks Plunging Swimsuit On Vacay!

Who needs a bikini when you’ve got a plunging neckline??

Not Christina Applegate — who is looking fab and healthy and happy while on vacation with her hubbie Martyn LeNoble and daughter Sadie Grace on the beaches of Haleiwa!

That fit body at 41 is lookin’ great! Who says a one-piece can’t be as sexy as a bikini?? Not us!

We just hope she’s wearing sunscreen! Ha!

Have fun, guys!

[Image via AKM-GSI.]