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Gigi Hadid

Vantagenews / AKM-GSI

Gigi Hadid appears to be wearing her heart on her, um, chest.

While out and about in Paris Friday during Men's Fashion Week, the 20-year-old model was spotted wearing cleavage-bearing BOSSA bodysuit that highlighted a curious piece of bling—a gold chain with a pendant bearing the letter "Z"...what, or rather, who could that be?

Hadid, 20, has most recently been linked romantically to singer Zayn Malik, 23. She and the former One Direction member first sparked dating rumors when they were photographed together in November. Neither has confirmed a relationship. 

Gigi Hadid

Vantagenews / AKM-GSI

Relationship clues have been dropped sporadically. Malik posted on her Instagram page in December a photo of the two looking cozy. Earlier this month, the pair was spotted visiting apartments for rent in New York City. And Malik has even bonded with Hadid's catCleo.

Hadid also appeared to pay tribute to her rumored beau with her phone wallpaper.

"They want to keep their private life as private as they can," a source had told E! News recently. "They were friends first and it has turned into more of a relationship at this point."

"They are not seeing anyone else—just each other," the source added. "Gigi thinks Zayn is a great kisser and their energy together is filled with sparks."