caused quite the scene as he sported lingerie and suspenders to support his Radio 1 colleague on his gruelling cycle challenge on Wednesday.
The Radio 1 Breakfast DJ, 40, is cycling 1000km in eight days on a tandem bicycle, and has been surprised by family and friends along the way, including earlier this week.
It comes a year after former star Jamie completed his own Comic Relief challenge, running five ultra-marathons in five consecutive days.
Greg supported him on his endurance challenge back then where he wore a wedding dress to run alongside him, and this week Jamie, 37, repaid the favour - albeit in a slightly more racy outfit.
He hopped on the back of the tandem bike in the skimpy outfit, before filming some hilarious dancing videos together for socials.
It comes after last year Jamie was joined for a period of his run by Greg who rocked a fetching ivory wedding gown.
Jamie Laing caused quite the scene as he sported lingerie and suspenders to support Radio 1 colleague Greg James on his gruelling Comic Relief cycle challenge on Wednesday
It comes a year after former Made In Chelsea star Jamie completed his own Comic Relief challenge - where Greg joined him in a wedding dress
Greg had previously told Jamie that he'd join him in his challenge in a wedding gown if donations exceeded £450,000, with fans smashing that total with ease.
The wedding dress was also in honour of Greg's now wife Bella who proposed to him ahead of his own Gregathlon challenge for Sport Relief back in 2018.
At the time Greg said of joining Jamie in the dress: 'The whole thing feels like a fever dream.
'I'm currently running with him, at his pace, which I've got to say is really amazing. Genuinely. For running nerds he's doing 6:00/km, still. Day 5.
'I'm with the couple of guys here that he's running with, proper long-distance runners looking after him on the road. And they've said they've not seen anything like it, for a non-runner to immediately fall into that sort of speed is crazy. He's just... he's on one!'
Speaking after his tandem escapade on Thursday Jamie said: 'It was funny and inspiring. Greg is doing such a great job. He's a beacon that is doing it all, and I'm sure would agree it's the team behind him, the radio 1 listeners and public who are the real superheroes because they are the ones donating to raise this incredible amount of money.
'The whole thing was awesome in every way. I loved every second of it, and I loved being in lingerie. I might wear it again!'
Greg added: 'He looked fantastic. Although it took some time to get used to! Fair play for turning up and dressing up like that. It put a real smile on my face in what has been a really tough day in the saddle.'
It comes after on Wednesday Greg shared the touching moment he told his mum that he was joined by on the bike trek, as his dad remains in hospital recovering from a stroke.
He was surprised by the Prince Of Wales on Tuesday, who revealed at that point he had raised £1million during the challenge. The total is now over £2.2million.
The Radio 1 Breakfast DJ, 40, is cycling 1000km in eight days on a tandem bicycle, and has been surprised by family and friends along the way, including Prince William earlier this week
He hopped on the back of the tandem bike in the skimpy outfit, before filming some hilarious dancing videos together for socials
Greg looked delighted as he set off with Jamie
He was surprised by the Prince Of Wales on Tuesday, who revealed at that point he had raised £1million during the challenge. The total is now over £2million
The pair set off together on the bike
It comes after last year Jamie was joined for a period of his run by Greg who rocked a fetching ivory wedding gown
Jamie braved the chilly spring weather in the skimpy look
They danced for the cameras before heading off
Jamie took the backseat as he joined Greg
The funny moment was sure to bring a smile to Greg's face amid the gruelling challenge
The public snapped some pictures of the funny moment
Just one week before he was due to start his mammoth challenge, Greg's father Alan suffered a stroke during a planned heart operation.
