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After bidding farewell to Lost last year, Naveen Andrews, 42, seems to have rediscovered his romance to longtime girlfriend Barbara Hershey.

The twosome, who announced last May that they had separated six months earlier, were seen walking hand-in-hand at the BAFTA Tea Party at L.A.'s Four Seasons Saturday.

And while the Black Swan actress, 62, played it coy with in late November when asked if she was dating someone -- "Oh, I don't know about that," she replied -- onlookers say the pair seemed smitten at the pre-Golden Globes event.

"He was dragging her about from person to person," a witness tells Us, adding, "She introduced him to people as her boyfriend."