Britney Spears and her former husband Kevin Federline have become best friends, according to her sister.
Jamie Lynn Spears told Hello! Kevin, who split from Britney three years ago, had been taking care of the couple's two children on the singer's US tour.
Kevin, who has custody of Sean Preston, 3, and Jayden James, 1, is also apparently on good terms with Britney's parents.
"Kevin has been great, as always,” Jamie Lynn said.
“He and Britney have become best friends. She knows how much he cares about the boys and he knows the same is true of her."