Kim Kardashian was seen "laughing" and having a good time with ex-boyfriend Reggie Bush, according to reports.

The former couple finally ended their on-again, off-again relationship in March 2010 but are said to have remained friends.

They were allegedly seen spending time together at the Beverly Hills hotel on Sunday and enjoyed lunch poolside at the Cabana Club Caf.

"Kim was joined by a female friend and Reggie was with a friend too," the source told Life & Style magazine.

"She was wearing a mini dress and platforms with full hair and make-up. Kim sat right next to Reggie and looked really comfortable."

The pair apparently spent more than an hour together and the Keeping Up With The Kardashian star looking like she was enjoying the time with the NFL player.

"She and her girlfriend were laughing [with the guys]," the source added. "It was obvious that they'd all planned to get together and didn't just run into each other.

"They were being careful, you could tell. Kim gave Reggie a kiss goodbye on the cheek."

Kim had an ill-fated 72-day marriage to basketball player Kris Humphries and is now going through a divorce.

"He's been supportive to her since the breakup of her marriage, and they wanted to go out for lunch," the insider said. "It wasn't romantic. If Kim had any feelings that it was going to be romantic, she wouldn't have gone somewhere so public."