Melissa Benoist, Chris Wood, Grant Gustin join the lineup
Tatianna, Riley Knoxx joined the 'You Need to Calm Down' singer on stage
The pop star says she was 'overwhelmed' to return
The pair performed the song at World Pride
'You are enough'
Matty Healy doesn't 'think we'll be allowed back'
Pal Todrick Hall inspired her
The gesture is illegal under the country's 'gay propaganda' legislation