LeAnn Rimes and Eddie Cibrian Engaged....

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.

According to that same source, the couple designed the ring with Cibrian's childhood friend, Brent Polacheck of Polacheck Jewelers. "The couple wanted an antique feel, but a new ring," the source revealed.

Rimes and Cibrian met and began a relationship while filming the Lifetime movie, 'Northern Lights' in 2008. Both were married at the time but have since divorced their spouses to be together. Rimes has since been very open about the difficulty of ending her first marriage to Dean Sheremet after news of her relationship with Cibrian made headlines.

"I take responsibility for everything I've done," she told PEOPLE earlier this year. "I hate that people got hurt. But I don't regret the outcome."

When the couple marries, Rimes will become stepmom to Cibrian's two children from his previous marriage to Brandi Glanville: Mason, 7, and Jake, 3