Dan and Phil have taken over the internet and now they're going for the book charts.
The YouTube vloggers - Dan Howell and Phil Lester - have topped the non-fiction bestseller list with their debut The Amazing Book is Not on Fire, beating new works from travel writer Bill Bryson and footballer Steven Gerrard.
The book is outselling every other adult non-fiction release with 26,744 copies shifted in a week, according to this weekend's Sunday Times bestsellers list.
This follows the success of fellow vlogger Zoella, whose 2014 debut novel Girl Online broke the record for highest first-week sales of a first-time novelist since Nielsen BookScan began compiling such records in 1998.
Dan and Phil, who met online and now live together in a North London home where they make their videos, have over 10 million subscribers on YouTube.
The Amazing Book is Not on Fire features over 200 pages of anecdotes from their Radio 1 show, behind-the-scenes photos and some helpful advice for readers.
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Dan and Phil are also on tour promoting the book, hitting the London Palladium on November 8.
Watch a clip from Dan and Phil's YouTube channel below:
