LeAnn Rimes: I'm Not Trying to Replace Brandi Glanville

Credit: Jason Merritt/Getty Images; Steven Lawton/FilmMagic

LeAnn Rimes insists she isn't trying to replace model Brandi Glanville, mother to Eddie Cibrian's two sons.

On Twitter, a fan blasted Rimes, 28, after the country crooner kept referring to Glanville's sons, Mason, 7, and Jake, 3, as her "boys."

"Please remember those 'boys' have a Mother," the fan wrote her. "It seems you don't give credit to that. Hapnd to me not a good feeling."

Rimes shot back, "I do, but it doesn't mean I can't share our happiness. Please remember I'm a part of their lives too. Seems people don't give credit to that."

Cibrian, 37, shares custody of his sons with Glanville, 37, with whom he divorced last year after having a fling with Rimes on the set of a Lifetime movie (Rimes also filed for divorce from husband Dean Sheremet).

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Cibrian and his boys recently moved in with Rimes.

Living together seems to be going well.

Rimes recently Twittered: "So sweet when a 3 year old climbs in bed and says "why are you so pretty!" what a doll he is, so kind :) It's amazing the things kids say."