Kaley Cuoco recently cheered backstage while her little sister Briana took the spotlight on The Voice USA, making headlines the world over with her incredible rendition of Lady Gaga's You & I.
Oscar-winning actress Penelope Cruz had her second baby just months apart from her fellow actress and sister Monica, and the duo designers have created collections together for Spanish retail giant Mango back in 2007, as well as more recently, saucy underwear entitled L'Agent. Monica even acted as her sister's body double in Pirates of the Caribbean, when Penelope was pregnant with her first child.
Scarlett Johansson often attends red carpet events such as premieres with her twin brother Hunter on her arm, and the two shared screen time back in 1996 with comedy-drama Manny & Lo.
Oscar winner Ben Affleck shares the big screen with his younger brother Casey, who was nominated for his own Oscar for his role in The Assassination of Jesse James by the Coward Robert Ford – in which he starred alongside Brad Pitt. He also worked with his brother Ben in Ocean's Eleven.
HELLO! Online takes a look at celebrities – including Beyonce, Liam Hemsworth, Hilary Duff, Nicole Kidman – and their siblings...