Gigi Hadid and Zayn Malik 'Squish' in PDA-Filled Pic

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These two are definitely back on.

After celebrating Fourth of July with a girls' weekend at Taylor Swift's annual Rhode Island soiree, Gigi Hadid is back in the arms of Zayn Malik.

WATCH: Taylor Swift and Gigi Hadid Were Totally Twinning in Red, White & Blue Swimsuits During 4th of July Bash

In a snap posted to her Instagram, the 21-year-old supermodel comes face-to-face with her on-again beau -- literally -- as he leans in for a kiss.

"Squish ya," Hadid captioned the pic.

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squish ya

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Although PDA is nothing new for the couple, it's the first we've seen since they reconciled last month. 

Though Hadid and Malik are clearly back on, a source told ET when they rekindled their relationship last month -- after a week-long break up -- things are still a bit rocky.

"Yes, they're back together, but [it] could be over again in any second," the source said. "Gigi is obsessed with Zayn -- she won't let go of him too easily."

Judging by their Instagram accounts, it's easy to assume they're pretty obsessed with each other.

NEWS: Zayn Malik's Ideal Date Night with Gigi Hadid Isn't What You’d Expect

The couple doesn’t just show off their PDA on social media; they've also taken their love to the pages of Vogue.

See more in the video below.

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