Leann Rimes insists she isn't trying to be a mother to Eddie Cibrian's two sons.

The singer-and-actress - who lives with her 'Northern Lights' co-star and his boys, Mason, seven, and three-year-old Jake, from his marriage to Brandi Glanville - hit back at claims she was trying to replace the model in the children's lives after referring to them as her "boys" on her twitter account.

One of her followers wrote: "Please remember those 'boys' have a Mother. It seems you don't give credit to that. Hapnd to me not a good feeling. (sic)"

To which LeAnn replied: "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."

Eddie and Brandi - who divorced last year following his affair with LeAnn - share joint custody of their sons.

LeAnn recently took to her twitter account to say how happy she was with her new family unit.

She tweeted: "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. (sic)"

Last month, LeAnn - who was married to ex-husband Dean Sheremet when she met Eddie in early 2009 - and Eddie moved into her home together along with Mason and Jake.

A source said: "It just made sense for them. Eddie's lease was up and LeAnn's home was bigger and already familiar to Eddie's sons.

"It's somewhere the kids know and it allows Mason to stay in the same school district, which was important to them, that there's continuity for him. They take moving in with the kids with a lot of responsibility. They want to make sure that it was done in the right way."