Reese leaves the tough question to Ryan

While promoting her new movie Just Like Heaven on Jay Leno last night, Reese Witherspoon told a story about her and husband Ryan Phillippe’s son Deacon, 23 months. Apparently he is always asking mom what things are, leading him so far as to ask what exactly is in his pants. Reese said that she got freaked out and called, "Ryyyaannn…" who came in, asked her to leave the room, and emerged later with Deacon, who proudly told Reese that he has a "peepee."

She also chatted a bit about taking Ava to Disney’s California Adventure for her 6th , which is tomorrow. Unfortunately for Reese and her party, that trip ended in the arrest of an overaggressive paparazzo who was scaring the children in Reese’s group.

Danielle adds: I watched Reese’s appearance too and was going to post about it but Sarah cut me to the chase.  Reese also told Jay that when she took Ava and her "girlfriends" to Disney, Ava was enthralled by dancing with Prince Charming.  Afterwards, Ava remarked to Reese that Prince Charming was "sexy."  Reese asked her what that meant and Ava replied, "I don’t know!"

TV cap from 2004 Leno appearance courtesy of Glamour Reese.