However, it emerged that Smithy was in fact marrying his girlfriend, Sonia, who is quite frankly a stuck up b**ch. This development was much to the chagrin of Smithy's family and friends, who also didn't take kindly to Sonia.

Laura Aikman, who played Smithy's wife-to-be in the finale episode of Gavin & Stacey, was sworn to secrecy and even signed a non-disclosure agreement to keep her appearance a surprise

Gavin and Stacey star Laura Aikman, 39, stole the show as Sonia in the long-awaited finale – and fans are concerned. The beloved BBC comedy finally returned five years after leaving us on the agonising cliff-hanger when Nessa ( Ruth Jones) proposed to Smithy ( James Corden) after he’d rowed with girlfriend Sonia.

"Gavin & Stacey" star Laura Aikman took her NDA so seriously she even kept her appearance in the 90-minute special a secret from her own family. Aikman, who plays the widely-disliked Sonia in the cult BBC series,

Gavin And Stacey star Laura Aikman has revealed her family only discovered she was returning to the BBC sitcom while watching the finale on Christmas Day.

Laura Aikman, who plays Sonia in Gavin and Stacey, has shared a video of her family's reaction to her character's return in the final episode of the BBC sitcom