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Meet Lily Allen’s half-sister Teddie Malleson-Allen, who was at a Young Sherlock premiere
STORYIshani Sarkar
The 19-year-old – who starred in MobLand with Tom Hardy, Pierce Brosnan and Helen Mirren – just attended Prime Video’s Young Sherlock event
One of the most highly anticipated TV releases of March 2026 is undoubtedly Young Sherlock. The Amazon Prime Video series, executive-produced by Guy Ritchie, stars Hero Fiennes Tiffin as the titular character alongside his uncle Joseph Fiennes, as well as Colin Firth, Natascha McElhone, Zine Tseng, Dónal Finn and more.
The world premiere of the British show was a star-studded affair in London, but it was a newcomer who stole the spotlight: Teddie Malleson-Allen. The 19-year-old is the half-sister of Grammy-nominated singer and actress Lily Allen and Game of Thrones star Alfie Allen.
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So, what else do we know about Teddie Malleson-Allen?
Who are Teddie Malleson-Allen’s famous parents?
Teddie and Lily share the same father, Trainspotting actor Keith Allen. Her mother is actress Tamzin Malleson, who co-starred with her father in the TV show Bodies. Though it appears they haven’t married, the pair have reportedly been together since 2005, per Hello! magazine, and welcomed Teddie on April 9 the following year.
Keith was previously married to Alison Owen – with whom he shares Lily and Alfie Allen – and Nira Park.
Where have you seen her before?
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