When the Tracy Beaker theme tune drops and you physically can't stay still... 🕺🎶 You can catch That's Watson on Saturday Mash-Up! on CBBC and BBC iPlayer now! Saturday Mash-Up! is CBBC's live show where anything can happen, featuring Joe Tasker, Shereen Cutkelvin and Stanley the Monster, plus celebrity guests, hilarious challenges, cartoons and, of course, plenty of slime! #SaturdayMashUp!