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Stars at the People's Choice Awards relay messages to President-elect Donald Trump. (Jan. 19)
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"Big Bang Theory" star Johnny Galecki made waves at Sunday's People's Choice Awards, stepping out with his much-younger girlfriend and making their relationship red-carpet official.

The 43-year-old walked the red carpet with 21-year-old girlfriend Alaina Meyer. The couple has been popping up on each other's social media feeds since September, when they made things Insta-official.

"Peeps choice was so fun with my bae," Meyer captioned a photo on her Instagram page.

"Big Bang," which will be 12-season run in May, Jim Parsons for star TV comedy.

Johnny Galecki and Alaina Meyer are now red-carpet-official. (Photo: Matt Winkelmeyer, Getty Images)

Nearly all of the main cast members have hit major relationship milestones during the show's decade-plus run.

There have been four weddings. Kaley Cuoco, who plays Penny, gets married twice, first to pro Ryan Sweeting in 2013 and then to her husband, equestrian Karl Cook, this summer. Kunal Nayyar, who plays Raj, married Indian beauty queen Neha Kapur in 2011. Parsons married his longtime partner, Todd Spivak in 2017.

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Simon Helberg, who plays Howard, married wife Jocelyn Towne the summer before "Big Bang" went on the show. Melissa Rauch, who plays her wife Bernadette, married husband Winston before she joined the show, but welcomed her first child in 2017.

Mayim Bialik, who plays newlywed Amy, was married with two sons before joining the series but divorced in 2012.

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