John Mellencamp has officially divorced his estranged wife Elaine Irwin Mellencamp.

The 'Under the Boardwalk' singer - who is believed to have been dating actress Meg Ryan since the couple split - filed for divorce on January 14 after an 18-year marriage to the model, who is set to share joint legal custody of their sons, Hud, 17, and 16-year-old Speck.