Her oldest daughter, Alexa Ray Joel, whom she shares with singer Billy Joel, slammed an Instagram user who presumably left a mean comment comparing Joel’s looks to those of her younger sister.

The couple announced their engagement on New Year's Day. Alexa Ray Joel is getting hitched! The singer and daughter of Billy Joel and Christie Brinkley announced her engagement to Ryan Gleason ...

Considering Alexa’s parents are Billy Joel and Christie Brinkley, it shouldn’t come as a surprise that show business was in her blood. Now 38-year-old Alexa has been singing and writing music ...

Alexa, whom she shares with ex-husband Billy Joel. “Mom… what’s happening here?” the singer-songwriter, 38, commented, along with a laughing cat emoji. Related: Christie Brinkley Gushes ...

as well as special guests daughter Alexa Ray Joel, Jason Bonham, John Mayer and Trey Anastasio. The clip, cued to his melancholy 1976 track "New York State of Mind" flashed images of Joel on stage ...