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Benji Madden, Cameron Diaz


Could these newlyweds be any cuter?

Benji Madden wished his wife Cameron Diaz a very happy birthday by posting the sweetest message to her on Instagram for fans to gush over.

Alongside an adorable selfie of the two lovebirds snuggled up to one another, with the following letter to the A-list actress…

"Happy Birthday to my Beautiful Wife [heart emoji] My best friend and Everything else—there's so much I could write," the singer began his heartfelt message.

"I'm the luckiest guy alive—I get to spend the rest of my life right here. I love this woman!! Many more baby!!"

Diaz turned 43-years-old Sunday and was spotted arriving in Los Angeles early Monday morning with her main man by her side.

The twosome appeared to be all smiles after their trip to Sydney, where Madden has been hard at work filming the Australian version of The Voice.

Aw, we hope Diaz got her hubby's cute-as-can-be message on Instagram—it is not to be missed!