After a tumultuous two years making headlines in the tabloids, LeAnn Rimes and Eddie Cibrian are officially getting married.

"Yes, they were engaged over the holidays and are very happy," her rep tells PEOPLE exclusively. The couple spent the Christmas holiday at home in Los Angeles and a source tells PEOPLE, they "had family and close friends in town who helped them celebrate."

Rimes also shared her happiness on Twitter Monday afternoon: "Thank you for all your well wishes!! We are extremely excited and look forward to a beautiful future. It's been an incredible last few days, I was shocked!!! We are blessed, our families are so happy and our lives are filled with love," she Tweeted.

Rimes and Cibrian were spotted Monday on the beach in Malibu--and the country singer was sporting a new engagement ring. A source close to the couple tells PEOPLE that the platinum ring features a 5-carat oval diamond set in rose gold fleur-de-lis connected to the band.