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John Mayer has prepared his own serenade to help his girlfriend celebrate the big 4-0.
"He did write a special song just for her for her birthday," a source tells PEOPLE of the Grammy winner. No word yet on his performance!
Think you know Jen well enough to write your own birthday tune? Take PEOPLE.com's Jennifer Aniston birthday quiz!
RELATED ARTICLE:
• PEOPLE rates John's boyfriend style
RELATED GAME:
• Match John & Jen with their famous exes in Love Connection
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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