Billy Joel's ex-wife Christie Brinkley danced along as he performed "Uptown Girl," the song he wrote about her, during a recent show at Madison Square Garden, according to a video shared on TikTok. The model, 70, was seen swaying and singing the hit track with a huge grin on her face.

The mother-daughter duo supported Billy Joel (Christie’s ex-husband) at his Madison Square Garden show April 26 Christie Brinkley and her daughter Sailor Brinkley Cook know a thing or two about show business — and decided to lend a helping hand to Grammy-winning artist Billy Joel.