No stone was left unturned during Hilary Duff's visit to 'Watch What Happens Live' last night (Oct. 8).

One of the hottest Hilary-related topics -- aside from her new music, of course -- is her former relationship with Aaron Carter. The 'Ooh Wee' singer made headlines earlier this year after saying he wants to win the former 'Lizzie McGuire' star back.

"I don't know what to say about it," Hilary admitted. "It was so many years ago. I literally haven't seen him in -- so it's uncomfortable ... He was very sweet -- when I was 13."

Host Andy Cohen also asked Hilary who she would rather switch places with -- Lindsay Lohan, Amanda Bynes or Miley Cyrus -- while a caller asked Hilary if she ever regretted turning down a movie role. (Hilary wouldn't name a specific movie, she did say that Nicholas Sparks' 'A Walk to Remember' was "close.")

Check out the video above to see Hilary dish on her relationship with Aaron Carter, and check out the videos below to see her talk Miley, her son Luca and more!

Hilary Duff Talks Miley Cyrus

Will Hilary Duff Have More Kids?

See Hilary Duff + More Celebs With Surprising Tattoos

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