Federline's ex refuses to meet extended family

Kevin Federline's ex-girlfriend Shar Jackson refuses to meet his children with Britney Spears because she wants to keep her life separate from the pop star.

Jackson and Federline have a son, Kaleb, two, and a daughter, Corey, four, while Federline also has two sons with Spears, Sean Preston, one, and Sutton Pierce, who was born on 12 September.

Although Jackson considers Spears a part of her children's "extended family" she draws the line at meeting her children's step-siblings, Sean and Sutton.

In an appearance on the Dr Keith Ablow Show, to be screened on Thursday, she insists: "I like to keep my distance."

Federline left Jackson while she was pregnant with their second child and went on the European leg of Spears' tour shortly after meeting her in a Hollywood nightclub.

Jackson insists she wasn't sorry that her own relationship with Federline broke-up, but was devastated that her children's stable family life was in jeopardy.

She explains: "As far as I was concerned, I was OK that the relationship ended...but the family breaking up is something painful.

"And honestly I didn't let it happen. Now in the beginning it was rough, because he was overseas, so I really didn't have much control over there.

"But when he came back home, I told him, 'Kevin, I'm not going to let you be a convenient father, when it's convenient for you.'

"If you are going to be part of these kids' lives, then you're going to be a part. If not, then you're not.'"