That's why there's Twitter!
Franco was late to the party, but thankfully we got tons of interesting nuggets from Rogen!
But be warned... they are literally ALL spoilers!
So, here's what we learned from their live tweets:
The boys hit the stage with their smash single, What Makes You Beautiful, for their first performance ever on the Swedish version of the show!
Check out the Brits taking over with WMYB (above)!!
The XF contestants even got to get in on the 1D fun and took on the song, as well! Liam, Niall, Zayn, Harry and Louis then performed their other hit, Live While We’re Young!