The plotline will go as follows: Duff's character Sophie is telling her son how she met his father, and the show is a flashback to the year 2021 in which a group of friends navigates dating in a world amid dating apps and modern love.
The spinoff will be titled How I Met Your Father, will be ten episodes long, and has been picked up by Hulu.
According to a source, it is unclear how or if the show will relate to the original in any way.
Duff will also partake as a producer on the spinoff. "I've been incredibly lucky in my career to play some wonderful characters and I'm looking forward to taking on the role of Sophie," said Duff. "As a huge fan of 'How I Met Your Mother,' I'm honored and even a little nervous that Carter and Craig (the HIMYM creators) would trust me with the sequel of their baby."
The HIMYM franchise has attempted to create a spinoff before, back in 2013 with How I Met Your Dad, starring Greta Gerwig, but it never got picked up.
How I Met Your Mother ran for nine seasons and 208 episodes from 2005-2014.
The release date for How I Met Your Father has yet to be announced, but stay tuned!
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