Watch the moment Cat Deeley leaves Hollywood superstar Ben Stiller STUNNED live on This Morning

CAT Deeley has left Hollywood legend Ben Stiller stunned after showing him just how invested she is in Severance.

TV presenter Cat, 48, was interviewing Ben on This Morning when she produced a large, green exercise book from beside her.

Much to Ben's amazement, she then opened the book to reveal pages upon pages of handwritten notes about Severance.

Cat admitted she writes down everything that is going on in the Apple TV+ thriller in order to keep up.

Ben gasped at Cat's commitment to the show, which he directs, saying: “Oh my goodness! Wow. Wow. I love that.”

A list star Ben was joined on Wednesday's This Morning by Severance stars Britt Lower, Tramell Tillman and Adam Scott.

The foursome were there to chat about the hit show and its upcoming third series.

However, Ben and the stars refused to give away any hints about what is to come – and they wouldn't even say when it will be available to watch.

Welcoming them to the studio with her co-star Ben Shephard, Severance super-fan Cat was unable to hide her excitement.

Her co-star Ben told her: “Can you just show them your notes.”

As Cat held up her exercise book and opened it up, Ben Stiller and the Severance stars all gasped.

“So this is like my history A Level that I had to write in pink pen,” Cat told them.

“It's because I've got to concentrate. You've got to concentrate.”

Laughing, Adam told her: “You're such a good student.”

Cat thanked him, as Ben Stiller joked: “Good luck on the test. You seem prepared!”

However, as much as she and Ben Shephard tried, they were unable to glean much information about the third series of Severance.

After firing questions at Ben Stiller, he joked back: “These are all great questions and I look forward to wondering about season three…”

And when asked when fans can expect the third instalment to drop on Apple+ TV, he refused to say.

Instead, Ben assured This Morning viewers that the gap between series two and three will not be as long as the last – which was a whopping three years.