Gigi Hadid couldn’t look happier as she walks arm in arm with Zayn Malik after reuniting with on/off boyfriend on his birthday

Gigi Hadid has officially rekindled her romance with ex-boyfriend Zayn Malik after breaking up a year ago.

The couple sparked rumors that they were back together when they were spotted out together Saturday, when he joined the celebrations for her mother’s birthday.

And Gigi couldn’t have looked happier as the two walked arm in arm while celebrating Zayn’s 27th birthday the next evening in New York City.

Birthday boy: Gigi Hadid sported an avant-garde look in black Sunday as she stepped out for boyfriend Zayn Malik's 27th birthday in New York City after rekindling their romance — Birthday boy: Gigi Hadid sported an avant-garde look in black Sunday as she stepped out for boyfriend Zayn Malik’s 27th birthday in New York City after rekindling their romance

Retro chic: Zayn cut a cool look in a retro crimson shirt with vertical cream stripes, open over a black t-shirt. He completed the look with a pair of slim black pants and a pair of black Converse All Stars

Grinning, she held tight to her boyfriend, who she has dated on and off since 2015.

Looking every inch the model, Hadid sported an avant-garde look in black and carried a slouchy iridescent sparkling handbag as she joined Zayn for dinner at Eleven Madison Park in the Flatiron District.

Following his love as they walked, birthday boy Zayn posted a proprietary hand on her behind.

The former One Direction star cut a cool look in a retro crimson shirt with vertical cream stripes, open over a black t-shirt.

Stars and stripes: It was paired with a flowy black satin duster tied at the chest and a pair of black trousers, featuring a white star and stripe down each side

Back in black: The 24-year-old donned a sleeveless crop top, trimmed in iridescent piping around the edges and the chest

The couple were spotted out the night before for Gigi’s mom Yolanda’s 56th birthday, sparking rumors they’d got back together.

A source told E! News: ‘Gigi and Zayn got back together right before the holidays in December. Zayn has been reaching out to Gigi for the last month and she is giving him another chance.’

They added: ‘She has always loved him and the break between the two was needed. Zayn has been working on his past music and focusing on his health and is in a really good place currently.

Reunited: The couple were spotted out the night before for Gigi's mom Yolanda's 56th birthday, before it was confirmed they were back together: 'Gigi and Zayn got back together right before the holidays in December' — Reunited: The couple were spotted out the night before for Gigi’s mom Yolanda’s 56th birthday, before it was confirmed they were back together: ‘Gigi and Zayn got back together right before the holidays in December

Gigi and Zayn began dating in late 2015 before splitting up in March 2018 and getting back together in June, just to announce another split in January 2019.

She appeared in his sensual video for his debut solo single Pillowtalk, which dropped in January of 2016.

They later appeared together on the cover of Vogue for the August 2017 issue, which sparked controversy for incorrectly referring to them as gender fluid.

Since their split, Gigi was briefly romantically linked to The Bachelorette alum Tyler Cameron over the summer.