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Gigi Hadid, Zayn Malik, Instagram

Instagram

Gigi Hadid and Zayn Malik's romantic flames are heating up!

The blond bombshell would never forget her new beau's 23rd birthday, so she took to social media to commemorate his special day.

The Maybelline covergirl posted a photo of a Z-pendant necklace with the date and time in the upper left corner. 

"ZDAY," she declared as the official new title for the day. 

While practically declaring the birth of her babe a national holiday, the runway regular will also be by his side as he celebrates the night away.

"Gigi and Zayn are spending the special occasion together," a source told E! News. "Gigi loves birthdays, so she is happy she can be there to celebrate with him."

Though it is unconfirmed whether she purchased the strand of bling, after a month of dating, she certainly bought the singer a few special items.

"She got him some thoughtful gifts that he will really like," the source added. 

Gigi Hadid, Zayn Malik, Birthday Necklace

Instagram

Since they started going out in late November, the attractive pair has been visibly inseparable. While it's only been a few weeks, the famous couple is preparing to take their budding romance to a new level.

"Gigi and Zayn have been hanging out more and more lately, but they are not ready to announce to the public that they are an exclusive couple just yet, even though they have made it official between each other," the source exclusively shared with E! News.  

"They want to keep their private life as private as they can," the source added. "They were friends first and it has turned into more of a relationship at this point."

Gigi Hadid, Zayn Malik

AKM-GSI

As they've gotten to know more about each other, the attraction between the stunning pair has only gotten stronger. 

"Gigi thinks Zayn is really edgy, sexy and loves his style. They are very compatible and always have a great time when they hang out. They are not seeing anyone else—just each other," the insider told E! News exclusively. "Gigi thinks Zayn is a great kisser and their energy together is filled with sparks."

As for Hadid's bevy of stunning pals, they're just glad she's glad. 

"Gigi's friends knows that she is a relationship kind of girl, so they are not surprised that she has a man so quickly after her break up with Joe Jonas," the source said. "As long as she is happy, they are supportive."