Kevin Federline’s ex Shar Jackson has jumped to his defense following cruel jibes about his recent weight gain.

K-Fed has been the ample butt of fat jokes following the publication of photos of him carrying a huge gut around a Los Angeles golf course last week.
 
But Shar Jackson - the mother of two of his kids - insists his rounder figure is the result of being a full-time dad.
 
"It's daddy weight!" she tells Usmagazine.com. "When you are a full time parent, sometimes you can't focus on you.
 
"If gaining a few pounds is your only problem, life's not too bad!"
 
K-Fed's rep is taking the same line on the weighty issue: "He’s a stay-at-home dad, and people tend to gain weight when they are home with the kids.

"He's very happy with the way he looks.”
 
In January, the wannabe rapper was awarded sole custody of of his two sons with Britney Spears.