The pair — each clad in boob-baring dresses — talked about "normal girlie things," according to an US Weekly spy.
"Kim has been to [Spears'] concert a few times. Britney and Kim love each other," the source said. At least that part is true — Kardashian tweeted about the newly engaged superstar's Los Angeles show last June.
"Seriously u guys, tonight @britneyspears just had the best concert ever! She killed it in LA! Proud of u doll ;-) must see concert! (sic)," she tweeted.
This is probably bad news for LeAnn Rimes — after all, the two just emerged as besties after a church service in Calabasas in early February. They took in lunch a few days later with the church's pastors and America's Got Talent judge Howie Mandel.
Of course, they also cemented their relationship via Twitter.
"Great seeing you and the fam. See you soon! Xoxo," Rimes tweeted. "You too babe!" Kardashian replied.
But Rimes can probably rest easy, though — Spears is too busy planning her upcoming wedding to Jason Trawick and watching Modern Family to have time for a friendship with the divorced reality star.
"I know everybody is excited about the Super Bowl, but I personally can't wait to see the next episode of Modern Family! Funniest show on TV," she tweeted on Feb. 1.
Will she grace the small screen on a future episode of the show? We hope so! Kardashian can probably give her a few pointers for the show, too.
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