Reality rumble!

Though Whitney Port, 25, and Lauren Conrad, 25, were close pals on The Hills, an insider tells the new issue of Us Weekly (on stands now) that the two have gone their separate ways.

"Whitney is upset because she thinks that The City was canceled to make room for Lauren's new reality show," the source tells Us. "Whitney feels like she got the shaft."

(Ironically, Conrad's latest MTV venture was scrapped February 4 after the network deemed it too "high brow" for its current lineup.)

For more details on why the former BFFs are feuding -- including why Port skipped Conrad's recent birthday bash -- check out this week's Hot Stuff video, as explained by Senior Editor Ian Drew and Beverly "Bevy" Smith.

Also in the roundup: Miley Cyrus plans to spoof herself on Saturday Night Live, Kate Hudson suffers some "serious" morning sickness, and more!