Britney Spears To Collaborate With Rihanna – Kellie’s Showbiz Top 5 [AUDIO]

It's Monday and it's time for Kellie's Showbiz Top 5...  What's with Usher's love for older dominating women?  Well, his latest girlfriend has a him doing some pretty incredible stuff.  Next up we have a look at one of the guests for Oprah's final few shows.  Is Lady Gaga OCD?  Friends and staff on her tour are increasingly saying yes.  Britney Spears news, her upcoming collaboration with Rihanna and the announcement of her opening act on her tour.  And finally, the reason why Pia Toscano's exit from Idol is a good thing.