Lady Gaga Celebrates Her Engagement With the 'Chicago Fire,' 'PD' Casts!

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The 'Applause' singer celebrated her recent engagement with her fiance's co-stars.

After getting engaged on Valentine’s Day, Taylor Kinney introduced Lady Gaga to his family on Tuesday -- or at least his Chicago Fire and Chicago P.D. family, that is.

Sophia Bush, who stars on P.D., took to Instagram on Wednesday to post a super cute photo of her and the Artpop singer hanging out at a party for the show’s producer, Dick Wolf.

Bush captioned the pic, "#wcw @LadyGaga, naturally. She SLAYED the #Oscars and now she's snuggled up with the #ChicagoFam celebrating love. "The Oscars were amazing, but this!? This is everything." Oh #TaylorKinney you're a lucky man!! #love #congrats."

Gaga lucked out as well, getting a half-million dollar, heart-shaped diamond engagement ring. The couple have been dating since 2011, after Kinney starred in Gaga’s music video for her single "You and I."

VIDEO: Lady Gaga Coming to 'American Horror Story’ -- Watch Her Creepy Promo!

It was a big day for Gaga -- aside from partying with her finance’s friends, she was also busy promoting the upcoming season of American Horror Story, which she will be starring in. Check out the video below for a look at her creepy announcement.