She's Jelena Abbou, a Serbian-American competitive body builder and fitness model.
As Jenna Sauer at Jezebel says:
"A man with a six-pack is supposed to be sexy; a woman with a six-pack is supposed to be 'mannish.'
That's bullshit.
Don't look for her in Cosmo anytime soon, though.
More photos below.
Via Jezebel.
See more photos of Abbou here.