No dye-lemma here: When Michelle Trachtenberg is filming in NYC -- more than 2,000 miles from her L.A.-based hair colorist -- she takes matters into her own hands with John Frieda's Precision Foam Colour.
"It's foolproof," the Gossip Girl actress, 26, raves to Us Weekly about the solution, which comes in 20 colors.
Her new favorite shade? Brilliant Brunette Deep Brown-Black ($12.99, ulta.com). "I'm naturally dirty blonde and I've worn a reddish brown for a bit," she says.
Like many blonde-born stars who have traded their sunny strands for darker locks (Audrina Patridge, Katy Perry, and Leighton Meester to name a few), the star absolutely loves sporting a deeper hue.
"I feel sexier when I'm dark! I love how darker hair brings out my eyes and also complements my pale skin," she tells Us.