Career: In 1995, Timberlake, then just 14, and Chasez joined the boy band N'Sync, and had huge success with a string of number one singles and albums. Timberlake eventually went solo, and his debut album Justified was an acclaimed success; he's since released the albums FutureSex/LoveSounds and The 20/20 Experience. He has several acting credits to his name, including The Social Network, Shrek the Third, Bad Teacher and Trouble with the Curve.

Career: In 2005, Seyfried played the lead role in one of the nine short films that made up Nine Lives. In the same year, she starred in independent film American Gun. She went on to make guest appearances in a number of TV shows, including House, Law & Order: Special Victims Unit and CSI, before landing a key role in HBO drama series Big Love. She stayed on the show for four seasons before deciding to concentrate on making films. During her time in Big Love, she enjoyed success on the big screen in the hugely popular Mamma Mia! (2008), Jennifer's Body (2009), Chloe (2009), Dear John (2010), Letters to Juliet (2010) and Red Riding Hood (2011). More recently, she had supporting roles in Les Miserables (2012) and The Big Wedding (2013). She played the lead role in box-office flop Lovelace (2013).

Career: In 1996, Murphy made his professional stage debut in Enda Walsh's Disco Pigs. The runaway success of the play prompted him to leave university and quit his band, and led to him landing an agent. Between 1997 and 2003, he busied himself in an array of indie productions, but it was his powerful performance in the 2002 thriller 28 Days Later that really got him noticed. Since then, he has notched up impressive performances in a number of diverse films, including The Wind That Shakes The Barley, Sunshine, Girl with a Pearl Earring, Cold Mountain, Red Eye, Batman Begins, The Dark Knight, Inception and Tron: Legacy. He's also the star of the BBC's Peaky Blinders.

Career: Four years later, he landed what would become his big break - the role of David in hit comedy series Roseanne. He played the articulate but unworldly lad for five years. This led to a series of similar parts, this time on the big screen, in movies such as I Know What You Did Last Summer and The Opposite of Sex. His CV also includes appearances in Vanilla Sky, My Name is Earl, Hancock and Table for Three. In 2006, he took to the stage in a Broadway production of The Little Dog Laughed (which also featured his first nude scene). He returned to the small screen for the sitcom The Big Bang Theory.