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Paris Hilton was accompanied by sister Nicky Hilton to Britney Spears' Los Angeles concert Monday night, and a former "sister" was also there: Nicole Richie.

Paris and Nicole famously starred on The Simple Life together, but had a falling out in 2005. They reportedly made up in March 2010 after seeing each other at a Beverly Hills party, but Paris did not attend Nicole's 2010 wedding to Joel Madden. She did reportedly send a gift.

No word on if they ran into each other, but Nicole Tweeted a pre-concert vid of herself paying homage to Britney's dance moves.

Paris, who X17 can exclusively report has not split from boyfriend Cy Waits (contrary to online reports), sent several Tweets from the concert; see what she said after the jump!