Poor, poor Kourt.
The source says of Disick:
She ain't no Hollaback Girl, but Gwen Stefani is a flashback girl- which is to say she's looking as hot as ever, reminding us of Gwen from a decade ago!
(OMG can you believe Hollaback Girl is ten years old? We are freaking out at that!)
Ch-ch-check out the video (above) to see the perf performance!