Kourtney Kardashian raised eyebrows by stepping out with singer Justin Bieber over the weekend. The 37-year-old "Keeping Up with the Kardashians" star was spotted with her 22-year-old rumored ex-fling Saturday in Los Angeles following her reported reconciliation with Scott Disick. Kardashian and Bieber stopped by The Peppermint Club in West Hollywood after attending Jessica Alba's birthday party for husband Cash Warren, according to People. Sources said, however, that the pair are just friends despite their friendly reunion. "[Kourtney and Justin] hung out together with friends, but didn't spend the night together," an insider said. "Kourtney is still serious about making things work with Scott," the source explained. "They chatted, had fun but that was it. Kourtney is finished hooking up with Justin." Us Weekly reported that Kardashian and Bieber moved to Delilah after The Peppermint Club and parted ways around 2 a.m. The pair were first linked in late 2015 following the reality star's split from Disick. "Every time Kourtney and Justin are together they're extremely flirtatious. They text each other all the time," a source told the magazine in December 2015. Kardashian and Disick spent the holidays together after reportedly getting back together in November. The couple share three children, 7-year-old son Mason, 4-year-old daughter Penelope and 2-year-old son Reign.