Stars of 'The Big Bang Theory' on The Talk

Actor Kunal Nayyar (CBS's "The Big Bang Theory") discussed his upcoming three-night guest hosting stint on "The Late Late Show" on Thursday, February 13, 2015. From left, Sheryl Underwood, Kunal Nayyar, Sara Gilbert, Sharon Osbourne Aisha Tyler and Julie Chen, shown. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actor Simon Helberg (CBS's "The Big Bang Theory") discussed his new film on Thursday, January 29, 2015. From left, Sara Gilbert, Sheryl Underwood, Simon Helberg, Julie Chen, Sharon Osbourne and Aisha Tyler, shown. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Kaley Cuoco-Sweeting (CBS's "The Big Bang Theory") visited the ladies of THE TALK on Monday, September 22, 2014. From left, Sheryl Underwood, Sara Gilbert, Kaley Cuoco-Sweeting, Sharon Osbourne, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Kaley Cuoco-Sweeting (CBS's "The Big Bang Theory") posed with the ladies after her visit on THE TALK on Monday, September 22, 2014. From left, Sheryl Underwood, Sara Gilbert, Kaley Cuoco-Sweeting, Sharon Osbourne, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Kaley Cuoco-Sweeting (CBS's "The Big Bang Theory") took a selfie with Julie after her appearance on THE TALK on Monday, September 22, 2014. From left, Kaley Cuoco-Sweeting and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Mayim Bialik (CBS's "The Big Bang Theory") visited THE TALK on Tuesday, March 11, 2014. From left, Sara Gilbert and Mayim Bialik. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actors Simon Helberg (CBS's "The Big Bang Theory") and Jocelyn Towne visited the ladies of THE TALK on Thursday, June 12, 2014. From left, Sheryl Underwood, Sara Gilbert, Simon Helberg, Jocelyn Towne, Sharon Osbourne, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actor Johnny Galecki (CBS's "The Big Bang Theory") visited THE TALK on Thursday, March 10, 2011. From left, Sharon Osbourne, Sara Gilbert, Johnny Galecki and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Mayim Bialik (CBS's "The Big Bang Theory") visited THE TALK on Tuesday, July 19, 2011. From left, Leah Remini, Sara Gilbert and Mayim Bialik. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actor Kunal Nayyar (CBS's "The Big Bang Theory") guest co-hosted THE TALK on Thursday, June 13, 2013. From left, Sheryl Underwood, Sara Gilbert, Kunal Nayyar, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actor Matthew Morrison visited THE TALK to chat with the ladies and guest co-host Kunal Nayyar (CBS's "The Big Bang Theory") about his new album; plus, he performed live on Thursday, June 13, 2013 . From left, Sheryl Underwood, Sara Gilbert, Matthew Morrison, Kunal Nayyar, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

The ladies and guest co-host Kunal Nayyar (CBS's "The Big Bang Theory") tested Matthew Morrison's Broadway knowledge with a game of "Clue-sicle Theater" on Thursday, June 13, 2013. From left, Matthew Morrison, Julie Chen, Aisha Tyler, Kunal Nayyar, Sara Gilbert, and Sheryl Underwood. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

The ladies and guest co-host Kunal Nayyar (CBS's "The Big Bang Theory") sat down with Actor Dean Cain, who joined the show as a surprise celebrity guest dad with his son Christopher as part of "Who's Your Daddy?" Week on THE TALK on Thursday, June 13, 2013. From left, Sheryl Underwood, Sara Gilbert, Christopher Cain, Dean Cain, Kunal Nayyar, Aisha Tyler, and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Radio personality Big Boy, of "Big Boy's Neighborhood" on Power 106, joined the ladies and guest co-host Kunal Nayyar (CBS's "The Big Bang Theory") on Thursday, June 13, 2013. From left, Sheryl Underwood, Sara Gilbert, Big Boy, Kunal Nayyar, Aisha Tyler, and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Kaley Cuoco (CBS's "The Big Bang Theory"), host of the 2013 "People's Choice Awards," visited THE TALK to preview the show on Wednesday, January 09, 2013. From left, Sheryl Underwood, Sara Gilbert, Kaley Cuoco-Sweeting, Sharon Osbourne, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.

Actress Kaley Cuoco (CBS's "The Big Bang Theory"), posed with the ladies after her appearance on THE TALK on Wednesday, January 09, 2013. From left, Sheryl Underwood, Sara Gilbert, Kaley Cuoco-Sweeting, Sharon Osbourne, Aisha Tyler and Julie Chen. Watch The Big Bang Theory Thursdays at 8/7 c on CBS.