"Yes, they were engaged over the holidays and are very happy," Rimes’ rep told People on Monday.
The “How Do I Live” singer had been spotted earlier Monday wearing a new 5-carat oval diamond engagement ring, according to the mag.
Rimes and Cibrian met on the set of the TV movie “Northern Lights” and struck up an affair while both were married to other people. They have fended off engagement rumors for months.
In November, the country star called out E! News in particular for a story she said was “150% not true.”
"Eddie and I are beyond happy and in love and look forward to one day sharing such private news with you all and hopefully will be able to enjoy it privately and share it with our family and friend's before the world knows,” Rimes wrote on her Twitter page at the time.
To be sure, the couple had stoked those rumors when they shared a Halloween photo online that showed Cibrian down on bended knee, with Rimes holding her hand over her mouth as if he’d popped the question.
Rimes, who was divorced from Sheremet in June, tweeted a show of support at the time.