This is that famous guitar riff in the song:
e|--6h7-6-----6---6h7-6----6-------6h7-6----6---6h7-6------------------------|
B|--7---7--9--7---7---7-9--7-9-----7---7-9--7---7---7-9--7-9-----------------|
G|--6---6--10-6---6---6-10-6-10----6---6-10-6---6---6-10-8-10----------------|
D|---------11-----------11---11----------11-----------11-9-11----------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|
the fill after she sings "girls just want to have fun" in the verses:
e|-----|
B|--7--|
G|--8--|
D|--9--|
A|--9--|
E|-----|
have fun.