Heidi Klum, 49, flaunts incredible figure in sheer dress with thigh-high split at AGT show | Celebrity News | Showbiz & TV

Heidi Klum, 49, boasted an unusual blend of sparkly diamonds and punk rock chic as she debuted a crystallised, floor length gown which laced up in three sections from head to toe.

The maxi gown had a split up one side, revealing a peek of Heidi’s long, lithe limbs and black peep toe heels.

Meanwhile, the German-American model turned TV talent judge, who is married to Tokio Hotel guitarist Tom Kaulitz, showcased her voluptuous cleavage in the gown.

Last night, she congratulated the winner of the show – the all-female alternative Lebanese dance group Mayyas.

Although Heidi has worn diamond outfits before, this sensational number proved almost as attention-grabbing as the show’s winning act.