1.
Michelle Obama in "iMeet the First Lady"
2.
Emma Stone in "iFind Spencer Friends"
3.
Jimmy Fallon in "iShock America"
4.
Tina Fey in "iShock America"
5.
Jordan Fisher in "iSpeed Date"
6.
Jane Lynch in "iSam’s Mom"
7.
Austin Butler in "iLike Jake"
8.
Emily Ratajkowski in "iSpeed Date" and "iEnrage Gibby"
9.
Jim Parsons in "iLost My Mind"
10.
Chord Overstreet in "iSpeed Date"
11.
Jack Black in "iStart a Fan War"
12.
Victoria Justice in "iFight Shelby Marx"
13.
Randall Park in "iGot Detention"
14.
David Archuleta in "iRocked the Vote"
15.
Taran Killam in "iMeet the First Lady"
16.
Harry Shum Jr. in "iGo to Japan"
17.
Kenan Thompson in "iParty With Victorious"
18.
Lucas Cruikshank in "iMeet Fred"
19.
Last: One Direction in "iGo One Direction"
What other celebrity guest stars do you remember on iCarly? Let us know in the comments below!