I'd say drop it, because TGUS has a shorter time slot than TGUK because of different commercial breaks, so they don't have as much time for it. On top of this, personally, I rarely enjoy watching any of the "star" segments whether it is TGUK/TGUS/TGAUS or even Fifth Gear. Even with TGUK, yes they now get bigger stars, but they are there just to plug their book/movie/tv show, of which we need to watch at least a two minute preview.
Here's a thought, let them do star interviews for 2 out of every 3 episodes, this could potentially leave them with more time on some of the better segments, while still keeping the stars to promote the show.