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MORE celeb photos from the Cosmo's NYE party last night -- this time the theme is couples ... Mel B and Stephen Belefonte, Forest Whitaker and wife Keisha, Ellen Pompeo and hubby Chris Ivery, and the adorable Tatum Channing and his lady Jenna Dewan.

Who gets YOUR vote? I think Tatum and Jenna are too cute to resist but Keisha Whitaker's polished, chic, pitch-perfect look wins the biggest fashion thumbs up!

Oh, and I forgot to mention Ellen Pompeo's tux ...