Lady Gaga has opened up about her experience of 9/11 as the horrendous event's tenth anniversary approaches. 

Speaking to MTV as part of Viacom's 'I Will' campaign, the 'Judas' superstar revealed she was at school when the towers were hit and watched with her class as they fell to the ground. 

"I just remember that the history teachers had us all piled into one room and had a television on and none of us believed it was happening. So we didn't believe it, so we ran up to the roof and I just remember we got up to the roof, and one tower had already fallen and we all watched the second tower fall all together."

She also explained that her mother worked "right across the street" from the Twin Towers and she spent hours unable to contact her:

"My dad picked us up; we couldn't reach my mom for a long time because she worked right across the street. We were really nervous."

Gaga is also set to return to the UK later this year as a guest on The Jonathan Ross Show. She will appear on the programme on October 8 for an exclusive interview and is also set to perform for the audience and viewers. 

Watch her video for 'Yoü and I' here: