Kellie was born in Croydon and lives in SE London. She started her career via the National Youth Theatre and the BRIT school.
She can currently be seen playing Kirsty, in the award-winning comedy series In The Long Run (Sky One/Now TV/Starz) created by Idris Elba.
Recent TV work includes Call The Midwife (Netflix/BBC), True Horror (Channel 4), and the BAFTA-winning series Joe All Alone - where she played series regular Stacey.
Kellie is probably best known for playing Carly Wicks in Eastenders, clocking up over 200 episodes between 2006-2012.
Other TV work includes The Office Christmas Specials, 3-part BBC 4 drama: Twenty Thousand Streets Under The Sky and The Marriage of Reason and Squalor (Sky Arts).
Her film work includes King of Thieves (Studio Canal), Wimbledon (Working Title), Venus (MiraMax) and Heidi (Piccadilly Pictures).
Kellie plays the central role of Rachel in short film Who's The Daddy which was selected for Best World Short at the recent Galway Film Festival.
For theatre Kellie has worked for The RSC, National Theatre, Theatre Royal Haymarket, Royal Court, Soho Theatre, ATG, Lyric Hammersmith. She played the role of Pauline Clench in the International tour/West End of the National Theatre's hugely successful comedy One Man Two Guvnors directed by Nick Hytner.
She is an ambassador for the charities Anthony Nolan and Mencap.