updated 06/08/2011 AT 5:00 PM ET
•originally published 06/09/2011 AT 7:45 AM ET
AnnaLynne McCord, is that you?
The 90210 star (and animal lover) revealed a dramatic new hair color on Twitter this week – with the help of a furry friend.
“I’m in LOVE!!!!!!” McCord Tweeted on Tuesday, along with a photo of herself leaning over a snoozing white puppy. Bearing a slight resemblance to Alyssa Milano, the former blonde displayed dark brown tresses while wearing a cozy cardigan.