Tracy Spiridakos and Marina Squerciati Are Bestie Goals In New Celebratory Selfies

CHICAGO P.D. -- "Let it Bleed" Episode 1002 -- Pictured: (l-r) Marina Squerciati as Kim Burgess, Tracy Spiridakos as Hailey Upton -- (Photo by: Lori Allen/NBC via Getty Images)

Tracy Spiridakos posted a new set of photos of herself and Marina Squerciati, and the duo looks like total best friend goals in the smiley selfies.

On Tuesday, April 30, the former took to Instagram to show some love to her pal in honor of Squerciati's milestone birthday.

In the photos, the two Chicago P.D. stars are absolutely beaming while spending time together, posing alongside one another in one shot. A second image showed them laid out on a bed, hair sprawling out across the sheets, both rocking fun, star-shaped sunglasses.

"Happy Birthday @marinasqu ??????????," Spiridakos simply captioned the duo of images.

Fans poured into the comment section with sweet, celebratory messages for the actress, who is marking her 40th birthday this year.

"Hope you have an amazing day!! Love this duo!! ????," one gushed, while another called the costars "Friends 4 Life ??????."

A third sent in well wishes for the mom of one to "enjoy your special day! ??????????," as an additional Instagrammer chimed in with, "SO SWEET!!! ?????."

"Aweeeee you guys are the best," yet another wrote of the pair.

Viewers of the NBC police procedural are always thrilled to get a glimpse at the personal lives of the women, who portray the characters of Kim Burgess (Squerciati) and Hailey Upton (Spiridakos).

Superfans of the show have been quite heartbroken as of late, though, as Spiridakos recently wrapped filming on her final episode with the series. She's set to exit after Season 11's finale after seven years.

But luckily for supporters, there will likely be many more sightings of the besties together—even if they are off-screen.

Next: Fans Hope Jesse Lee Soffer’s Photos Mean He’s Returning for Tracy Spiridakos’ Final Episode