Christie Brinkley is still Billy Joel’s muse nearly 30 years after their split.

The “Vienna” singer, 74, serenaded his ex-wife during his New York City concert at Madison Square Garden Friday night.

The former supermodel was all smiles while Joel sang “Uptown Girl,” which he wrote about her at the start of their romance in the early ’80s, in front of nearly 20,000 fans.

Billy Joel serenades ex-wife Christie Brinkley with ‘Uptown Girl’ during concert