Alyson Hannigan had one goal when she appeared on Dancing With the Stars season 32: to make it to Taylor Swift night. As it turns out, Hannigan, 51, later learned that the "Cruel Summer" singer herself was tuned into the show when her honorary episode came around. "That was the night I freaked out the most because I was like, 'Wait, I just wanted to get here, I didn't know I'd actually have to do it. And what if she's watching?'" she recalled to Joey Graziadei on the official Dancing With the Stars podcast on Thursday, September 25.