Billy Joel has got married again in a surprise Fourth of July ceremony – and it seems his ex Christie Brinkley couldn’t be happier for him.

The Uptown Girl singer, 66, wed his fourth wife Alexis Roderick, 33, on his Long Island estate in front of surprised guests who thought that they were attending an Independence Day party, according to Mail Online.

His second wife, former supermodel Christie, 61, offered her congratulations on Instagram…but may have highlighted the couple’s big age difference, whether accidentally or not, by referencing her daughter with Billy, Alexa, who is just a few years younger than the bride at 29.

She captioned the picture of the happy couple: “Congratulation to the glowing bride and groom.. And to my daughter Alexa, who has a wonderful friend in Alexis! Wishing the growing family every happiness!”

However, Christie has stayed on very good terms with her former husband, who is now expecting a baby with new wife Alexis.

Billy and Christie were married from 1985 to 1994, after his marriage to Elizabeth Weber, which lasted from 1973 to 1982 ended. He married for a third time to Katie Lee in 2004, but got divorced in 2010.