Zayn Malik and Gigi Hadid are having their relationship scrutinized by the public. Zayn substituting Gigi for another girl in his new music video and Gigi suffering a nip slip on Versace runway have been sending the fans into a frenzy into guessing what this may mean for the future of their relationship.

"A number of fans were upset when they discovered Gigi Hadid, 20, was not the blonde female starring in Zayn Malik's video for his second single, "It's You," despite the person looking like her in the 15-second teaser. Instead, Bates Motel actress Nicola Peltz, 21, landed the highly-coveted role," according to Hollywood Life.

This comes at the heels of the model's nip slip on Versace runway.

"The model-of-the-moment's right breast popped out of her low-cut dress at Milan Fashion Week," reported Page Six. A source even said, "That was even more Gigi than Versace paid for, I bet! They got some bang for their buck with that casting."

While it is really hard to see how Zayn Malik and Gigi Hadid are doing, there are a few instances that reveal the texture of their budding relationship. First of all, the singer attended Grammy afterparty without his famous girlfriend Gigi Hadid, which sent the fans speculating if he was up to no good.

"The chart-topper was spotted cutting a solitary figure as he joined a Grammy Awards afterparty at LA nightspot 1Oak," according to Daily Mail.

But the fact that he is in awe of his girlfriend means that they have a mutual respect for each other. Gigi Hadid's career is making her boyfriend Zayn Malik very proud.

"Zayn is completely blown away with Gigi's new Vogue Paris cover," an insider told Hollywood Life. "He already has it framed on his wall with graffiti all around it with the words 'My Girl' written above it."

Looks like Zayn Malik is a big fan of Gigi's naked body.

But their hot romance isn't something that will fizzle out over night. Another one of Hollywood Life's sources say that "Zayn and GiGi are getting serious. Gigi was so excited when Zayn asked her to be in his music video. They both acted very professional on set, but it was very obvious that they were in love. They couldn't stop flirting with each other."

The fact that Gigi Hadid did not hold back in making out with her boyfriend in his music video shows that she is in it for the long haul.