VIDEO: Simon Cowell Talks Susan Boyle Aspergers Diagnosis on LENO

Simon Cowell stopped by The Tonight Show with Jay Leno last night and spoke about the recent news that Britain's Got Talent star Susan Boyle had been diagnosed with Aspergers. Later, Cowell admitted his biggest regret of his career was failing to sign the Spice Girls.

Check out clips from last night's appearance below!

"The Tonight Show with Jay Leno" features a nightly monologue (the longest in late night), news-making guests, and ongoing comedy segments, including "Headlines," "Jaywalking" and "Battle of Jaywalking All-Stars." The result is a unique and humorous look at the daily happenings in the news and in pop culture.

The program is also a proven barometer of political clout. In 2009, the show made history by being the first late-night show to host a sitting president when Jay Leno welcomed President Barack Obama as a guest.

"The Tonight Show with Jay Leno" is from Big Dog Productions in association with Universal Television. Debbie Vickers is the executive producer.

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