Credit: Andrew H. Walker/

Nine days into her thirties, Jessica Simpson is already seeing the effects of aging.

"It is official -- I'm 30 and found a wrinkle," the singer Tweeted Monday. "Damnit!"

But despite her beauty woes, Simpson has a reason to smile: boyfriend of seven weeks Eric Johnson, who helped the singer celebrate her July 10 birthday on the Italian island of Capri earlier this month.

"He seems completely smitten," a source tells the new issue of Us Weekly.

And Simpson -- who once complained, "23 is old! It's almost 25, which is almost mid-twenties!"  -- is equally as head over heels.

"Eric clearly makes her laugh and he seems amused in her company as well," a source tells Us. " I know she is really happy."