Rainbow hair hues seem to be an unstoppable force!

Dakota Fanning and Jenna Jameson are the latest to join the throng of celebrities sporting unconventional hair colours this year. They join Kerry Katona, Bella Cruise and a host of others rocking the trend.

Fanning was papped in New York City with freshly dip-dyed pick locks, a look she dabbled with back in January last year. Sheltered against the cold snap in layered casuals and knitwear, the Twilight star clearly enjoyed the look the first time round, because this time it's brighter and grungier.

Meanwhile in Vegas, an obviously warmer Jenna Jameson celebrated an early birthday at the Crazy Horse gentleman's club. The adult star showed off her pastel green hair with a shaven blonde side atop a somewhat curvaceous outfit. The jumpsuit - a little risque, but it IS Jenna Jameson - was surprisingly on trend with it's blocked achromatic cutout panels.

Who will be next? Are you going to give bright colours a try?

Pop a comment below or tweet @HedRockHair to tell me what you think!