Seth Rogen hilariously trolls Ariana Grande and Pete Davidson for constant Instagram flirting

Ariana Grande and Pete Davidson went from zero to 100 with their relationship -- and Seth Rogen wishes they'd just hit the breaks already.

In the span of one month, the couple split from their respective partners Mac Miller and Cazzie David, confirmed their relationship with a Harry Potter-themed date night, got engaged with a $123,000 sparkler, then bought an apartment together in New York. Oh, and did we mention this all played out on social media?

So when the Saturday Night Live star again took to Instagram to marvel at his 24-year-old fiancée's back-bending flexibility, Rogen was ready to reach for the vomit bag.

"What the actual fuck," Davidson captioned the photo of Grande in lacy lingerie, to which she commented, "I love you." Naturally, smitten Davidson replied, "I love you more tho."  

Clearly having had enough of the PDA, Rogen, 36, trolled the photo, commenting, "Guys, seriously."

But Davidson wasn't here for Rogen's trolling, so he jokingly hit back with, "When ur getting married to the hottest girl in the world you tell me how you'd act."

If it's any consolation to Rogen, at least Davidson kept his IG comments PG. The 24-year-old SNL funnyman revealed on Tuesday that he's tried to leave X-rated comments on Grande's Instagram pics but the site wouldn't allow it.

"I tried to comment something filthy but it didn't let me. I'll just tell you later :)," Davidson wrote under a video of Grande dancing on stage.

Phew, sounds like Rogen could use the break!