After 13 years in the role, as the voice of Peppa Pig.
And now it's been confirmed that the new voice star is set to be EastEnders actress Amelie Bea Smith
Harley, now 18, has played the main character in the children's cartoon since she was just five years old, and has appeared in 185 episodes, which earned her a BAFTA in 2011.
From Valentine's Day she will be replaced by nine-year-old Amelie, who becomes the fourth actress to play the anthropomorphic pig.
Harley, who is currently in her final year of her A-Levels, said she was looking forward to the "next chapter" as she paid tribute to the cast of the show in her statement.
Amelie, who appeared in several episodes of EastEnders in 2018 and 2019, will first appear in a Peppa Pig episode next month.
Her agent Mark Jermin said: "Amelie has been a huge fan of the show since she was little, so voicing the title role is like a dream come true and she's thrilled to become part of the voice cast."
Peppa Pig co-creators Neville Astley and Mark Baker, from animation studio Astley Baker Davies, said: "We're delighted to welcome Amelie to the Peppa Pig voice cast and confident that she will continue the strong legacy of the previous Peppa voice actors.
"Lily Snowden-Fine defined the role when she first voiced the character in series one at age five."
They added: "Lily passed the baton to Cecily Bloom for series two before handing the reins to Harley Bird.
"As our longest-standing Peppa, Harley's award-winning contribution to the show over the past 13 years has been tremendous, making her a key part of the success of Peppa Pig."
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