It's not Princess Di, but the cast of Saturday Night Live is a little gaga at the prospect of working with the show's past royalty. To celebrate SNL's 20th anniversary this fall, some former Not-Ready-For-Prime-Time Players have been invited to return and host, including Dan Aykroyd and Bill Murray. ''It's going to be surreal,'' says current SNL-er Adam Sandler. ''Bill Murray came by recently to talk. There's nothing better than when Bill says, 'Hey, that thing you did was funny.''' Sandler, who just finished filming Lifesavers with Steve Martin, found himself tongue-tied in front of Martin, who will also join the festivities. ''Steve would ask me a question,'' says Sandler. ''I would just look at his lips moving. Steve was like, 'It's okay, Adam. You can talk.'''


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