New level of friendship unlocked 🔓💖 Melissa McCarthy put on a disguise to sneak onto the set of 'Law & Order: Special Victims Unit' so that longtime pal Mariska Hargitay would have no idea the comedian was this week's guest star in a scene with Olivia Benson. Sharing a video of the big reveal, McCarthy wrote on Instagram: "Sometimes you just have to show up to give a proper ATTA GIRL to a total (ultimate) boss lady ⭐️ Turns out it is VERY hard trying to keep secrets from therealmariskahargitay on her set but we managed to pull it off and in a world where things are heavy and dark but this day was PURE JOY 🥹🎉💓 Mariska, you are the real deal. Sorry everyone lied to you, hope it was worth it (this surprise was six years in the making people)!!! PS LOOK MA I FINALLY MADE IT ON LAW & ORDER 👮🏻!!!!!" 🎥 melissamccarthy #MelissaMccarthy #MariskaHargitay #LawAndOrder #SVU