Lonan and Will are joining the show for its eighth series along with Lucy Watson's sister Tiffany.
Will, 24, is a romantic at heart and guilty of falling in love hard and fast. He went to the same university as Alex Mytton, but he isn't just a party boy. Will is also a trained freestyle ski instructor, cyclist, surfer, skateboarder, entrepreneur, property developer, adrenaline junky and personal trainer!
Meanwhile, 25-year-old Lonan is director of an elite personal training company, where his good friend Will works alongside him. Lonan, who also went to university with Alex, also knows Toff (Georgia Toffolo) from the Chelsea social scene. Lonan has a penchant for fast cars and petite blonde women!
After a dramatic summer in New York, the entire cast are now back in London, and native New Yorker Alik Alfus - who is loved-up with Louise Thompson - is also joining the gang in the popular SW3 postcode.
Viewers will see the return of Andy Jordan, as he didn't jet out to New York due to other work commitments. Stephanie Pratt will also be making a permanent return after setting up home in London.
The new eighth series of MIC will feature 11 hour-long episodes kicking off next week.
Sarah Dillistone, executive producer, said: "After an exciting summer in New York, the cast are back to Chelsea with a bang. With three new cast members thrown in to the mix, expect even more drama, rivalries and jaw dropping storylines for series 8…"
Meanwhile, Dom Bird, head of formats at Channel 4, said: "It's great to have our Chelsea crew back on British soil for more champagne and shenanigans."
Made in Chelsea airs from Monday 13 October at 9pm on E4.
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MIC series eight trailer: