The curse of Karl STRIKES AGAIN!

Sarah is feeling the strain as the pressure mounts on Today

- 

While they appear cool as cucumbers when the cameras are rolling, it seems behind the scenes things aren't so rosy for Today hosts Karl Stefanovic and Sarah Abo.

A well-placed source has lifted the lid on the "pressure" currently mounting among the cast and crew, with Karl, 48, and Sarah, 37, finding it the hardest to put on a smile for the cameras as the ratings roll in. "You can definitely tell they're feeling it. Their banter isn't as seamless as it was."

The source says it's Sarah who's under the most pressure, with the stress of wanting to deliver proving to be too much, despite Karl's best efforts to reassure her that she's doing a good job. It became apparent during a recent taping of the show, where a strained Sarah seemed noticeably agitated in between takes.