» 2020

Rihanna tells Diane Sawyer on '20/20' that the fight between her and then-boyfriend Chris Brown last February was ignited by a text message he received on the night the violence between the two took place.

Rihanna alleges the text message came from a former girlfriend of Brown's. "I caught him in a lie and he wouldn't tell the truth, so I wouldn't drop it," she said. "It escalated into him being violent toward me."

Watch the video after the jump.

Mark your calendars: On Sat., Sept. 5, ABC will officially debut its 2009 fall TV schedule, launching a full month's worth of series premieres ('Cougar Town'; 'The Middle'; 'Flash Foward'), along with the return of favorites like 'Grey's Anatomy,' 'Desperate Housewives' and the much-anticipated 9th season of 'Dancing With the Stars.'

Want to know when to save the date? Check out ABC's full schedule, including show titles, times and dates, after the jump.

'Lipstick Jungle'
(9PM, NBC)
In the penultimate episode of the show's second -- and potentially final -- season, designer Victory tries to come up with the perfect way to propose to Joe.

But her pals are in less romantic states, as Wendy finds out that hubby Shane is still considering going on tour with pop star Natasha Bedingfield (who guests), which would put a cramp in Wendy's personal and professional lives.

Nico, meanwhile, is still planning parenthood for her future, but her quest may be derailed by her ongoing struggle to get recognition at work and by her growing friendship with the boss -- very handsome boss -- Griffin.

'Dog Whisperer'
(9PM, NGC) 100th episode
It's a dog day evening on this special episode of 'Whisperer,' which finds Cesar inviting more than 100 of his past pooch guests and their owners to a party to celebrate his 100th episode.

Complete with red carpet (lined with fire hydrants), the soiree marks a successful dog run in which the trainer has rehabbed more than 300 dogs and 500 owners (in more than 100 cities), curing the canines of aggression, fear and out-of-control behavior and empowering their owners with skills to live happily with man's best friend.

And as a thank you for Cesar's animal magnetism, his party guests have a doggone good surprise for him: An appearance by his childhood hero, Lassie.