The `Modern Family` actress and the businessman - who got back together last month after splitting up in May following a series of arguments - have got engaged as the brunette beauty celebrates her 40th birthday in Mexico, a source has confirmed to Us Weekly.
An insider said: "They have a crazy relationship. They break up and make up. They fight and make up hard!"
Sofia - who turned 40 today on 10.07.12 - has been celebrating the milestone at a Mexican resort over the past few days alongside 90 loved ones, and she has was spotted wearing a diamond ring on her left ring finger on 09.07.12, Wonderwall reported.
The brunette star previously married Joe Gonzalez - with whom she has a son, Manolo, 20 - in 1991 but the pair divorced in 1993.
Sofia and Nickhave been dating for more than two years after meeting at a Golden Globes party in 2010, and following their split last month she is said to have moved into a hotel, but friends admitted at the time that they were unsure the separation would be permanent.