Britney Spears and her ex-husband Kevin Federline were under the same roof again … to attend the preschool graduation of one of their boys in Reseda yesterday. Whenever Brit and KFed get together it’s a special occasion.

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Hitting up the delectable Ruth’s Chris Steakhouse, the happy couple emerged from the restaurant smiling and laughing uncontrollably as Kevin carried their leftovers and even managed to light up a cigarette with Victoria hanging all over him at the valet stand.

Meanwhile, K-Fed recently revealed that his divorce from Britney Spears hasn’t ruined his desire to remarry.

Asked if he’d tie the knot again during a Ryan Seacrest interview, Federline replied, “Anything is possible. Would I get married again? Definitely.”

Then questioned as to whether he’s wary about another set of nuptials, Kevin answered, “No, I’m not. I just want to be happy. Right now, I really am happy. Victoria’s a great person. She’s an incredible person.”

The former backup dancer explained, “Once you get depressed, you don’t really feel like doing anything. You’re kind of discouraged about yourself and then the weight gain too, or that makes me more depressed. … I mean, it’s a combination of all of those things.”

K-Fed continued, “Everybody knows what happened with me and Brit. I’m not going to say that’s the total cause of it but, I mean, just not being happy with myself was probably the main part of my depression.”

Thanks to his time on VH1′s “Celebrity Fit Club: Boot Camp” Federline is in better shape, and he says things with Britney are getting better too.

“I think as time goes on, it keeps getting better and better and better. I mean, I’m really happy the way that my life is going right now, I really am. I think, you know, I have come a long way. All of us have…my whole family. It’s gotten so much better from where we were.”