United Kingdom, Aug. 18 -- Sam Asghari has scathingly branded Kevin Federline a "professional father".

The model, 31, made the biting remark about his former wife Britney Spears' ex, who has two children with the pop star, when asked for his thoughts on the release of DJ Kevin's forthcoming memoir, You Thought You Knew.

In a video shared by TMZ, Sam says when asked about the autobiography, which promises to delve into Federline's marriage to Britney and his experiences as a dad: "Well, he was a professional father."

Sam added: "It would be the first book that'll tell you how to be a professional father."

The remark was made while Asghari was leaving The Abbey, a popular venue in West Hollywood.

Kevin, 47, who was married to Britney, ...