This quote is from a short video showing Christina attending the US Weekly's Young Hollywood Hot 20 party.
"My assistant came in the room when it happened and was like 'Britney had boy! Oh my God... I don't know where I was at while she was pregnant but it really kicked in at that point. Wow, like a friend of yours for all those years, an old friend... You know you're in the same... (video cuts off)." Thanks UBritney.com