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Lizzy Caplan and Tom Riley Are Engaged

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Lizzy Caplan is going from TV mistress to real-life Mrs.

The Masters of Sex and Mean Girls star is engaged to British actor Tom Riley, PEOPLE has confirmed.

The pair made their red carpet debut at the Prague Opera Ball this past February, a year after they met in January 2015 while Caplan was filming in London.

Lizzy Caplan and Tom Riley
Sharpshooter Images/Splash News
Caplan, 34, accepted Riley’s proposal in May, according to E! News. She debuted her new sparkler at the Now You See Me 2 premiere in early June, then gave fans an up-close look at her romantic, vintage-inspired solitaire on a gold band, at the Ghostbusters premiere in July.

English-born Riley, 35, is best known for playing Leonardo da Vinci in Da Vinci’s Demons and will appear in Amazon’s The Collection this fall. Caplan will return to her Emmy-nominated role on Masters of Sex this September on Showtime.