Arriving together on Monday at the annual GQ Awards, Ellie and Dougie kept close to each other as they had their pictures taken, wrapping their arms around each other.
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Wearing a textured lacy gown, Ellie couldn't keep the smile off her face, while Dougie wore an unbuttoned shirt and suit, with a grey fedora.
The two had kept their blossoming relationship quiet for several months before Dougie outed the pair while speaking to Fearne Cotton during ITV2 documentary Fearne and McBusted.
"Yeah. All is good in that area," he shyly confirmed.
Ellie, meanwhile, opened up about their romance in a recent interview with Self magazine. "I've definitely met someone," she said. "You get to know someone who makes you very happy and then you go away (on tour), right when it was getting awesome. It's not fun but we can make it work."
They then began to make more public appearance, including holding hands as they made their way into the Chiltern Firehouse in June before turning the heat up on their romance as they headed to Ibiza for a summer getaway in August, where they were spotted cosying up to each other on their private boat.
Ellie, 27, focused all her attention on her McBusted beau as she blissfully wrapped her arms across his chest. The Burn hitmaker showed off her athletic figure in a floral printed black bikini, and added a touch of rock chic to her look with a backwards baseball cap.
In a sign that their relationship is serious, Ellie was also Dougie's date to his McBusted bandmate Danny Jones' wedding in mid-August.
The couple posed for official photographs with Danny and new wife Georgia Horsley, which ran exclusively in HELLO!, and Ellie was asked to sing her hit song How Long Will I Love You? for the couple's first dance.