Get a closer look at some of Hollywood's perfect pairs.

Hollywood Power Couples

Get a closer look at some of Hollywood&#39;s perfect pairs.

See our favorite pictures from red carpets, events, and more.

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Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Jim Parsons, Melissa Rauch, and Kunal Nayyar in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, and Jim Parsons in The Big Bang Theory (2007)

Johnny Galecki in The Big Bang Theory (2007)

Johnny Galecki and Kunal Nayyar in The Big Bang Theory (2007)

Kaley Cuoco and Johnny Galecki in The Big Bang Theory (2007)

Johnny Galecki and Jim Parsons in The Big Bang Theory (2007)

Johnny Galecki and Bill Gates in The Big Bang Theory (2007)

Mayim Bialik, Johnny Galecki, and Jim Parsons in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, and Kunal Nayyar in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, Jim Parsons, and Kunal Nayyar in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Melissa Rauch, and Kunal Nayyar in The Big Bang Theory (2007)

Johnny Galecki and Melissa Rauch in The Big Bang Theory (2007)

Kaley Cuoco, Johnny Galecki, and Jim Parsons in The Big Bang Theory (2007)

Aspiring film actress Penny moves into a Pasadena apartment across the hall from brilliant, but socially awkward, physicists Sheldon Cooper and Leonard Hofstadter and shows them how little they know about life outside of the lab.

Johnny Galecki: Leonard Hofstadter

The Big Bang Theory

Johnny Galecki credited as playing...

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