The UnbeWeaveable Billboard Awards

The Billboard Music Awards roared into Vegas on Monday, and Hollywood's biggest stars celebrated by gettin' wiggy with it.

From Janet to Gwen to Wynonna, there haven't been this many weaves, wigs and extensions on one stage since the RuPaul Show got cancelled.

TMZ has combed through the whole hair-raising experience; bringing you the best of last night's hair don'ts!