Nina Dobrev stuns in sultry lakeside getaway photo as fans praise her 'single girl era'

Nina Dobrev is turning up the heat this winter.

The "The Vampire Diaries" alum shared a sultry Instagram photo over the weekend, captioning it, "mentally on airplane mode," as she reclined in a serene lakeside setting. 

In the shot, Dobrev lounged in a circular, wood-paneled space that resembled a private sauna or retreat, wearing a sleek black two-piece string bikini and striking a relaxed, confident pose.

HOLLYWOOD'S BIGGEST MARRIAGES CRUMBLE AS NICOLE KIDMAN, KEITH URBAN AND...