They were first linked in late 2011 months after the Grammy winner announced he'd split from his wife Elaine Irwin. Three years later they parted ways before rekindling their romance later that year. Then, months later, they called it quits again and reunited once more in 2017.
Prior to their long-term relationship, Meg was wed to Dennis Quaid from 1991 to 2001. She shares son Jack Quaid, 27, with the Rookie star and is also mum to daughter Daisy, 15, who she adopted in 2005.
John has also endured a string of short-lived romances. The star has been married three times to Priscilla Esterline from 1970 to 1981, Victoria Granucci from 1981 to 1989 and Elaine Irwin from 1992 to 2011. He has five children, including famous Real Housewives of Beverly Hills star Teddi. He's also dad to Michelle, who he shares with Priscilla, Justice who he shares with Victoria and sons Hud and Spec who he shares with Elaine.