Adriana Lima received an engagement ring Thursday night – her birthday – from basketball star Marko Jaric, his rep tells PEOPLE.

“He asked and she said yes. They are both incredibly happy and couldn’t be more in love,” says publicist James Weir.

Lima, who turned 27 on Thursday, and Jaric, 29, who plays for the Minnesota Timberwolves, have been dating for about nine months.