Girls Aloud star Nicola began dating Charlie six years ago and, in 2010, they moved in together after buying a country house in Weybridge, Surrey.
However, according to reports, the couple called time on their relationship more than six months ago, but managed to keep the news private.
A source told The Mirror: "Nicola and Charlie split at the tail end of last year. They just kind of grew apart - they had a great run but both felt their relationship had come to an end."
Earlier this week, Nicola was seen arriving at Cheryl Cole and Jean-Bernard Fernadez-Versini's wedding party, which was held to celebrate their recent private nuptials.
However, while fellow Girls Aloud bandmate and BFF Kimberley Walsh was accompanied by her long-term partner Justin Scott, Nicola attended the glitzy event with her younger sister Frankie.
Following the party, Nicola cryptically tweeted: "Only when they look at you like magic." Could this mean there is a new man in her life?
Reveal contacted Nicola's rep but he had no comment to make.
Celebrity splits of 2014:
Copyright: WENN Apega