Genie in a bottle? Nope, Christina Aguilera prefers Latisse.

Although perhaps not the best spokes-person for natural looking, understated beauty, in the November 2010 issue of Marie Claire magazine, Christina Aguilera does list Latisse eye-lash enhancing serum as one of her can't-live-without beauty products. 

While I strongly suspect that she also is a fan of massive fake eye-lashes (as any self-respecting heterosexual woman with proclivities towards drag-queen style would be!), but no doubt if she is a true Latisse devotee, her real lashes are probably pretty fake looking now, even when she's not wearing a lick of make-up. (Hey, a make-up free Christina Aguilera could happen-- she has to shower at some point, right?)