The 'In The Limelight' challenge saw the celebrities showcase their talents in front of a panel of judges consisting of Jim Davidson, Linda Nolan and Luisa Zissman.
Dappy attempted to win over the judges with an acoustic performance of his 2011 track 'No Regrets', while Liz Jones gave a critique of the housemates' fashion sense.
Lee Ryan used his musical skills to write and perform an original song about his time on the Channel 5 show, titled 'Ruled by the Moon', and Casey Batchelor took on the persona of 'Racy Casey' to perform a monologue about her time as a glamour model.
TOWIE's Sam Faiers and Made in Chelsea star Ollie Locke performed a dramatic constructed reality scene, with the use of various props.
The duo's performance - which saw Ollie admit to 'girlfriend' Sam that he had feelings for Linda - won them the joint title of the 'most talented celebrity'.
Head judge Jim awarded the pair with a trophy and all of the housemates were treated to a party.
Celebrity Big Brother continues tonight (January 19) on Channel 5 at 9pm.
Watch Sam and Ollie's winning performance below: