The pair met when Dillon, 24, was hired to play guitar on Joel's upcoming album. (To listen to her first single, "Notice Me," click here.) "Dating can be awkward," Joel said in April. "I prefer to meet someone through work or socially."
Odds are her dad, Billy Joel, approves. Back in 2007, Dillon released the single "Christmas in Fallujah," which was written by the Piano Man himself. Proceeds benefitted the non-profit Homes For Our Troops.
But Alexa may not be the only member of the family getting some summer loving.
On Saturday, Billy, 61 (who split last June with wife Katie Lee, 28), was spotted having a late lunch with an unidentified blonde at Sant Ambroeus in Southampton, N.Y. The two carried motorcycle helmets (hers was pink), chatted with the owner and picked up local magazines before leaving.
MAXA / Landov
Reporting by KRISTIN BOEHM