Law & Order: SVU star Mariska Hargitay sent a sweet message to her former co-star, Christopher Meloni, on Thursday. And it was a big week for Meloni! On April 1, news broke that he would reprise his role as "Elliot Stabler" in a new SVU spin-off series. The actor then celebrated his 59th birthday on April 2.

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Actor Christopher Meloni in 2002

Law & Order: SVU - Mariska Hargitay and Christopher Meloni

For 12 seasons, Meloni had portrayed "Elliot Stabler" on SVU alongside Hargitay's "Olivia Benson." She's still with the long-running series today, but Meloni departed back in 2011.

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Hargitay took to Instagram to congratulate her former co-star on both of his big accomplishments: his new spin-off series and his 59th birthday.

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Law & Order: SVU reunion on Christopher Meloni's spin-off series?  

Hargitay's message said "Congratulations and welcome home," along with the hashtags "It'sBeenAWhile," "MissedYou," and "ElliotStabler." Meloni's new "Elliott Stabler" spin-off series is confirmed for 13 episodes, though few other details are known at this time.

Fans will hope for an eventual on-screen reunion between "Stabler" and "Benson," whether it's on SVU or Meloni's new series!

Law & Order: SVU is currently airing its 21st season on NBC.