John Mayer's Birthday Present For Jennifer Aniston?

When you’re dating a musician, you better get more than “Happy Birthday” on the big day, especially when you’re turning the big 4-0!

That’s exactly what John Mayer is rumored to have done for Jennifer Aniston. We imagine the song he penned for her goes something like “Oh Jen Aniston, guess what, you’re 40. Hey, at least you’re not Pete Doherty. That Angelina is so uncool, and your ex-husband is a tool. HAPPY BIRTHDAY!”

What John doesn’t know is that Jen doesn’t want a song – she wants a baby!

[Image via WENN.]