The Spice Girl, 50, who hasn’t worn colour for four years, opted for a warm roll neck jumper with a pair of wide leg trousers.
She completed her look with some nude platform heels and a matching leather handbag.
Joining Dermot O’Leary on his breakfast show, Geri was greeted by crowds of adoring fans who waited outside the building.
The singer opted for a subtle makeup look and pulled her hair back into a half-up half-down style.
Following the appearance, Geri later shared an update to Instagram as she reflected on her time on the Gran Turismo set with Orlando Bloom and David Harbour.
She wrote: ‘Finally… I can share this! What an epic adventure we had filming Gran Turismo. We were number one movie in USA!’
Footage shared from the trip in 2000 showed the pair frolicking together in their swimwear, enjoying boat trips and play-fighting.
Speaking about their Noughties fling, he explained: ‘It was a very confusing relationship because she’s a girl, I’m a boy, and we are very good friends trying to sort out the wreckage of the past.
Revealing his romance with the Spice Girl was doomed from the start, he said: ‘Our relationship starts when I’m in AA – you’re told not to get into a relationship in the first year and I get it – I can’t even look after a cactus let alone somebody else.’
Robbie added: ‘I found her company very, very easy – there is a silliness.’
‘We got on really well, it was fun, we were a little gang sharing a magical moment in a magical place… we were every fond of each other, I’ve got them, they’ve got me.’
Yet despite seeming in a good place and enjoying his extended break, Robbie confessed he was ‘craving normality’ as he struggled to adjust to his global fame.
Rumours had emerged that Geri was calling the paparazzi on the pair of them while they were trying to enjoy their time together, and Robbie confessed he believed them at the time.
He said he spoke to a paparazzo who blamed Geri, adding: ‘Now I don’t think that’s true for one second, but at the time I did believe it.
‘It just goes to show what being in the spotlight can do to your psyche, when you can’t trust anybody.’
Speaking about the moment he was told about the rumour he said: ‘It ruined in some way the memory of such a joyous part in my life.’
While Geri and Robbie’s romance was short-lived, Ginger Spice has spoken fondly of their time together, and previously revealed that Robbie helped her when her weight plummeted to seven stone after she left the Spice Girls.
Speaking on Piers Morgan’s Life Stories in 2010, she confessed: ‘I was worried I’d get fat. I would binge and then felt fatter and would make myself sick. It was awful.
‘Robbie knew about my bulimia and he advised me to get help. He told me to go to rehab and that possibly saved my life.
‘The bulimia would have got worse without it. I will always be grateful to him, always.’
She added that she and the former Take that star shared a close bond, saying: ‘I became really close to Robbie after leaving the Spice Girls and it was a very poignant friendship.
‘I was lonely and felt he was the only person on the planet who could understand me because of his experiences with Take That.
‘We understood each other. But I didn’t really go out with him. I am happy and healthy now.’
Robbie Williams, a four-part documentary series, is available on Netflix.