Proof Pete Davidson is 30, flirty and thriving on milestone birthday

Let the King of Staten Island's birthday celebration commence!

[{"selector":"#anim-db666c7d-de9b-4b53-8d7a-cc90f8834fcb","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5ffeaac3-dc70-4520-8930-cf62ad372b5e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-16cd6bb5-bfa9-4ba8-afab-5e9b75b08340","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}]

Pete Davidson turned 30 on Nov. 16, and in honor of his big day, his sister Casey Davidson took a trip down memory lane.

[{"selector":"#anim-80811de1-3420-4e4a-bd7f-cc95531ef839","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-494028a8-38bd-4929-954a-77e4ad89e34d","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c2d111f2-f3c8-419d-a236-2558ac7f369f","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}]

She wrote beneath the photos, "Happy birthday to my built-in bestie."

[{"selector":"#anim-f0ad21e6-c992-49db-b1b1-c29e9acae4ba","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7f8b8209-b8aa-407e-ac83-a2576677349e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-4f1dc3d0-ca51-4e7b-8a1f-25cf729fc7db","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}]

[{"selector":"#anim-9e35295f-dea0-4a70-8a5a-a8b0d2519626","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e4d69162-05c4-4339-9391-b323f67bfa96","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-aad5648b-09c0-4063-a585-1bf6cc7dae5a","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}] The 25-year-old shared a number of old pictures on her Instagram Stories, including one of the siblings making goofy faces and another of the "Saturday Night Live" actress cuddling up to Casey Davidson, who was grinning and throwing her arm up high.

A follow-up story featured Pete and Casey Davidson dressed to the nines, looking like a married couple. She also appropriately alluded to the 2004 film "13 Going on 30" in her caption, referring to him as "30, flirtatious, and thriving!

[{"selector":"#anim-8ae1bf47-41e8-4bb6-8559-231e360575b1","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-11f0c157-7f63-48f7-beb1-4f4b3a0764f8","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7c4be0ba-beaa-497a-bbfa-679e2d831e2b","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}]

[{"selector":"#anim-59cb42bf-3ae6-4727-bc24-ee991ed3d822","keyframes":{"transform":["translate3d(-100%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-4ee27512-5d6a-4688-8b02-bc69cf801ed5","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ca80b864-4c3c-4402-8b2d-2f93c651a529","keyframes":{"transform":["scale(0.15)","scale(1)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"forwards"}] Pete Davidson isn't going it alone as he enters a new decade. He made his formal debut as a new romantic with Madelyn Cline, an actress, last month at an evening in New York City. On October 15, the comedian and "Outer Banks" star walked out of the SNL after-party holding hands.

Thanks for reading follow for more update

[{"selector":"#anim-24624bde-6cde-4dcc-aa69-29d0791cb3ec","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-33c9975c-9dcc-4a1a-9e4f-33c8dd34a57d","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Learn more