Today on the Showbiz Top 5:  An update on Chelsea Clinton's marriage, an announcement that Miley Cyrus is to host Saturday Night Live, a not so nice comment about Jessica Simpson from fiance Erik Johnson, a look into the feud between Jeniffer Aniston and Heidi Montag, and news on Rihana's restraining order against Chris Brown.  Get all this from Kellie Rasberry by clicking 'READ MORE'...