Cat Deeley Thinks She Can Design Jewels Cat Deeley is on the up and up. The So You Think You Can Dance host will be premiering a QVC jewelry line Dec. 14 — two days before the show's finale. The collection is old-world-inspired — check this purple sparkler she recently wore from the collection. Cat's style is pretty freakin' cute, and I think we can expect the same from her bauble breakthrough.