The German presenter, 50, twirled for the cameras as she arrived in a long shiny dress with a daring split, and knee-high boots at Pasadena, California.
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Heidi made her debut as a judge in 2013.
The new season begins on May 28.
Heidi raised eyebrows on a recent getaway to the Caribbean island of St Barts.
At one point, she lounged on a rubber reindeer, flashing her behind in a black string bikini, as rocker husband Tom Kaulitz swum up for a chat.
The pair were also seen striding hand in hand along the sands.
Heidi even posed topless on the beach in snaps she shared with fans on Instagram.
The model gushed: “What a beautiful, beautiful day.”
Project Runway alum Heidi shares 19-year-old daughter Leni with her former ex and F1 boss Flavio Briatore, 70.
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