If this isn't a sign that they're back together, we don't what is.

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By the looks of it, on-again, off-again couple Gigi Hadid and Zayn Malik appear to be officially back on — if only because of their outfits.

The night before Zayn's 27th birthday, the pair were photographed arm-in-arm wearing coordinated couple's looks while walking around in New York City. Matching in mint green, Gigi wore a pantsuit in the pastel shade with a white turtleneck underneath and finished off her ensemble with white sneakers.

Gigi Hadid and Zayn Malik
Credit: Robert Kamau/Getty Images

Meanwhile, Zayn opted for a patchwork jacket, light-wash denim, and a pair of kicks that look identical to Gigi's.

Gigi Hadid and Zayn Malik
Credit: Gotham/Getty Images

Rumors of a romantic reunion between the two began back in December when Gigi posted an Instagram Story of herself cooking a recipe from Zayn's mom. A month prior, it was reported that the former couple was speaking again (shortly after Gigi split from Bachelor alum Tyler Cameron).

Gigi Hadid IG
Credit: mammamailk/Instagram. 

"They went through a phase where they took time apart and weren't communicating at all, but they have been in touch recently," a source told E! News in November. "She is supportive of him. They chat here and there but it's been casual."

Neither Gigi nor Zayn have commented on their current relationship status, but, if dressing in sync again isn't a sure-fire sign they're back together, we're not sure what is.