Derek Fisher and his girlfriend ended up in Sin City.

The former Knicks coach was spotted out in Las Vegas with Gloria Govan, who is the ex-wife of his former teammate and current Kings forward Matt Barnes, who has been outspoken about his anger about their relationship.

The couple was spotted at at Chris Paul's TopSpin Charity event in Las Vegas on Thursday, according to Terez Owens.

This latest event will likely make Barnes' blood boil. The small forward, who signed with the Kings on July 9, has been open with how much he loathes Fisher for being with his ex-wife, a star on "Basketball Wives: L.A."

Barnes and Fisher already got into a fight back in October at Govan's house. Upon hearing that his former teammate was attending a party hosted by his ex-wife and was romantically linked to her, an incensed Barnes drove over to Govan's house and got into a physical altercation with him.

Though Govan and Fisher, who was fired as Knicks head coach back in February, were first keeping their relationship private, they came out in the public with it back in March.

Barnes, who recently posted a meme knocking Fisher after the D'Angelo Russell-Nick Young incident involving "Swaggy P's" fiancée Iggy Azalea, was very open about wanting to fight Fisher again in the past, but it seems he may be getting past it.

"I know I got to keep my mouth shut because then he'll run and tell," Barnes said about Fisher in January during the lead up to a Grizzlies-Knicks game via The New York Daily News prior to Fisher's firing. "So we're focused on playing that team [the Knicks]. And when I'm retired, him and I will cross paths again."

Barnes also recently commented on a UFC video game simulation fight that saw him take out Fisher in the Octagon.

"My kids showed me that," Barnes told TMZ Sports. "That's what would really happen if it came down to it. I'll do it to him anywhere, boss."

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