They shared a meteoric rise to fame as part of Girls Aloud and have remained close ever since.
The pop singer, 32, shared a beaming selfie alongside the Geordie beauty, and gushed about her long-time friend in a sweet throwback post.
Cute moment: Cheryl enjoyed a mini Girls Aloud reunion with Nicola Roberts and Kimberley Walsh as she kicked off her 35th birthday celebrations
In the three-way selfie, Nicola, clad in a pink polo shirt and fresh-faced make-up, flashed a small smile towards the camera with a glamorous and beaming Cheryl nestled up to her shoulder.
Kimberley wasn’t too far behind, and lovingly clutched onto the Parachute hit-maker’s arm as she cracked a huge grin for the camera.
With all three chart-toppers positively glowing, Nicola captioned the sweet snap: ‘Friendship never ends. Birthday eve love for Chez last night’.
‘So lovely’: In the affectionate caption, the Lucky Day singer recalled how Cheryl had flown out to support her on her show in New York, and gushed over how ‘lovely’ the mum-of-one is
One photo was not enough for Nicola, who then posted another glamorous selfie with Cheryl and make-up artist pal Ama Quashie.
In the affectionate caption, the Lucky Day singer recalled how Cheryl had flown out to show support on her show at Madison Square Garden in New York, and gushed over how ‘lovely’ the mum-of-one is.
Nicola wrote: ‘I took this in New York a couple of weeks ago when missy (Cheryl) decided to fly out with me to support me at my show.
Reunited? Nicola’s sweet social media posts comes after rumours were swirling that Girls Aloud were going to reform five years after disbanding (pictured 2015)
‘It was the first thing I had done in a v long time and it was just another example of how lovely you are inside.
‘And when people were surprised that you had done something so kind all I had to answer with was that’s who she is.’
Explaining that the pair were jet lagged following the New York excursion, the copper-haired beauty continued: ‘I know I could throw anything your way and you’d be there trying to figure it out with me. I don’t know what I’d do without you. Happy Birthday beautiful’.
Nicola’s sweet social media posts comes after rumours were swirling that Girls Aloud were going to reform five years after disbanding.
Very close: Nicola has always remained close with Cheryl her BFF but now all five members are believed to be in contact with each other for the first time in years (pictured 2010)
The pop group, who have been mired by rumours of acrimony since their 2013 split, are said to be reforming to mark their forthcoming 20th anniversary.
According to The Sun, the reformation is the brainchild of Cheryl, who came up with the idea and approached pals Kimberley and Nicola about it.
Nadine Coyle and Sarah Harding have now reportedly been approached about getting back together, and the wheels are supposedly in motion for a full reunion.
The reunion tour is allegedly said to be on the cards as the girls are keen to get things planned ahead of the band’s 20th anniversary (which isn’t technically until 2022). MailOnline approached Girls Aloud representatives for comment at the time.
The group were propelled to fame in 2002 on ITV show Popstars: The Rivals but they went their separate ways in 2013 following the split.
Nicola has always remained close with Cheryl her BFF but now all five members are believed to be in contact with each other for the first time in years.
Star performers: The group were propelled to fame in 2002 on ITV show Popstars: The Rivals but they went their separate ways in 2013 following the split (pictured 2012)