Credit: Tiffany Rose/WireImage

Newlywed LeAnn Rimes is looking forward to Mother's Day -- even though the 28-year-old doesn't have any children of her own!

Rimes considers herself a "bonus mom" to new hubby Eddie Cibrian's two sons -- Mason, 7, and Jake, 4. (Their real mother, Brandi Glanville, sparred with Rimes publicly in the press until recently, when the two called a truce.)

"My first bonus mom day will be spent with Eddie here in Canada!" she wrote on her Twitter page Thursday. The singer-actress began shooting her new film, Reel Love, in Ontario on Monday. When one of her followers pointed out she wasn't actually anyone's mother, she replied: "It's not called stepmom's day lol common sense would explain that!!"

The film's makeup artist "gave flowers to all the moms for Mother's Day." She gushed: "So sweet! I had some sitting in my trailer when I got here today."