Who needs Vince Vaughn, Owen Wilson or Stage 5 clingers when you've got Justin Bieber and girlfriend Selena Gomez as real-life wedding crashers? The Biebs and his lady love crashed a wedding in Malibu on Friday night.

Apparently, the bride is Jeanine and her cousin posted a video on YouTube of Bieber, sporting a big white t-shirt with a golden $ on the front, as he posed for tons of iPhone photos with guests at the reception. PopCrush's favorite part of this clip?  Hearing people at the reception frantically calling for someone who left the dance floor and headed to the bar to grab a drink, thus missing all the action!

Overall, though, it was both a case of "speak of the devil" and "if you build it, they will come." Bieber and Selena just showed up to the wedding once they heard a karaoke version of Bieber's song, 'One Less Lonely Girl.' Bieber then posed for a couple of "official photos" with the newlyweds and an assortment of their guests. Gomez was not in the middle of the melee, standing off the side while her man actually took attention away from the bride and her dress for a few moments! Only in Justin Bieber's world, folks!

Jeanine's cousin posted a description on YouTube:

"Last night at my cousin Jeanine's wedding reception, out of nowhere, Justin Bieber shows up while one of his songs was being karaoked by one of the wedding guests. He stated that he was driving by the reception in Malibu and heard a party and his song being sung, so he decided to check out the event and ended up making a celebrity appearance."

The Bieb even acknowledged the fact that he and Gomez crashed the wedding, tweeting: "WEDDING CRASHERS last night. hahaha. too funny. crazy story." Crashing a wedding won't earn him any points with 'CSI' co-star Marg Helgenberger, who criticized the singer for his "bratty" behavior on set when he guested on the show.

Watch Justin Bieber Crash a Wedding