Check out what Ollie had to say in this Q&A below:
How are you celebrating being back on the MIC?
"I'm celebrating by spending time with all my old friends! It's so great to be back with the gang on the show. We've been partying hard, as always."
How are things with your co-star and good friend Binky Felstead?
"She's doing so well and it's great to see her in such a happy place."
You're a good agony uncle to Binky, but are you going to be getting a love interest?
"You'll have to wait and see. I love giving advice to my friends but it's also great to have fun yourself."
Binky and Spencer Matthews have both had big health kicks - have they inspired you to be more clean living?
"I watch what I eat more than doing any continuous exercise like running. I make sure that what I put in my body is clean and fresh."
You've been talking about blokes using make-up and looking after themselves - which celeb bloke would you love to get your hands on for a makeover?
"I worked with Johnny Vegas recently and I would love to put him through his paces."
Who do you think is looking the best out of the guys on MIC? Is anyone a contender to your crown of Best Hair?
"I think Sam Thompson is looking fantastic at the moment – he's really grown into himself."
What have you enjoyed most about the Stand Up To Cancer YouTube party?
"It was great to meet all the people involved in Stand Up To Cancer, and the other supporters including Joe Wicks, The Body Coach, and the gorgeous Foxes who I met on the day."
Why did you want to be involved?
"It's such a great cause raising awareness of the need for vital research. Cancer Research UK is a charity very close to my heart, so anything I can do to get involved and raise money is worth time to me. I was incredibly honoured to be approached!"
Is there anyone personally that you're Standing Up To Cancer for?
"Throughout the last 10 years a few of my school friends have been diagnosed with cancer, which has struck me deeply. Watching them fight through the awful disease made me want to do something to help."
Ollie was at the Stand Up To Cancer YouTube Party, a unique 12-hour live-streamed event raising money to accelerate new cancer treatments and tests and ultimately save lives. To watch or find out how to get involved, visit standuptocancer.org.uk/youtube. Stand Up To Cancer is a joint national fundraising campaign from Cancer Research UK and Channel 4.
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