Britney Spears’ Ex Kevin Federline Says He’s Rooting For Jamie Lynn On ‘DWTS’

Britney Spears has a rollercoaster relationship with her sister, Jamie Lynn … but Britney’s ex-husband is fully on Team Jamie Lynn as she competes on “Dancing With the Stars.”

Kevin Federline says his family — including his two sons with Britney — have been watching Jamie Lynn on the ABC dancing competition show and she’s got their vote.

K-Fed, Jayden James and Sean Preston recently moved to Hawaii … along with Kevin’s wife, Victoria … so the time difference makes it hard to watch Jamie Lynn live on ‘DWTS’ … but he told a photog on Oahu the fam watched Jamie Lynn after the fact.

Britney and Jamie Lynn have had their share of beef over the years … but as we first reported, Britney got a heads up her little sister was going to be on ‘DWTS’ and Britney was fully supportive and, apparently, even excited for JLS … and now we know K-Fed and the boys feel the same way.

It’s been about two months since Kevin moved the boys to Hawaii, where they’re living in a new rental home, and K-Fed says he’s got no complaints about their new surroundings.

Kevin and Victoria were on their way to The Lei Stand, a cocktail lounge in Honolulu, with another couple Monday night when he talked to a photog … and he’s already giving off island vibes.