Justin Timberlake and Jessica Biel Back Together: Which On-and-Off Couple Needs to Make Up Their Minds?

It's back on! Justin Timberlake and on-again girlfriend Jessica Biel hung with Elton John and his husband, David Furnish, on Wednesday at Timberlake's Southern Hospitality restaurant in New York City -- looking happier and cuddlier than ever in matching gray outfits.

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It wasn't the first time they've been spotted together since their split in March. Biel attended Timberlake's charity golf tournament and the after-party for his new movie "In Time," and Timberlake visited Biel in Toronto, where she was filming the "Total Recall" remake.

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But this latest photo seems to seal the deal -- they're officially back together. How times have changed since March, when they announced that they "mutually decided to part ways." Looks like a classic case of "can't live with you, can't live without you." Or "I wish I knew how to quit you," if you'd rather quote "Brokeback."

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From Timberlake and Biel to Miley Cyrus and Liam Hemsworth to Billy Ray and Tish Cyrus, let us know: Which on-and-off couple needs to make up their minds?