Moments before hitting the stage in Seoul, South Korea, Lady Gaga wrote to her adoring fans on Twitter, I can hear you Korea. I'm shaking.

Outside Seoul Olympic Stadium, where the 26-year-old superstar chose to have the first show from her tour, called the Born This Way Ball, hundreds of fans decked out in their Lady Gaga best waited in line to get in.

Perhaps Gaga's Twitter message was also for the hundreds of Christian student protesters who were outside the stadium. All week, the group has been calling for a nationwide boycott of Gaga's concert and even companies that have ties with the singer.

Some people can accept this as another culture but its impact is huge beyond art and debases religions. Even adults can't see her performance which is too homosexual and pornographic, Yoon Jung-hoon told Reuters on Friday. Yoon is a reverend behind Civilians Network against the Lady Gaga Concert.

Even with the Korea Media Rating Board changing its concert admittance age from 12 to 18 years old, protestors have been making plenty of noise. Earlier this week, more than 300 Protestant church members gathered for a prayer against Lady Gaga, her music and her concert.

We pray to God that the concert will not be realized so that homosexuality and pornography will not spread around the country, protester Kang Ju-Hyun told the AFP on Sunday.

Except for a series of tweets in early April when the concert admittance age was changed, Gaga has remained relatively silent on the subject, sticking mostly to posts about concert merchandise, rehearsal and anything related to the Born This Way Ball.

Nervous for tonight. Hope I make my little monsters happy and proud . . . this is a very special moment for Haus of Gaga. We thank you so much. Enjoy our music, fashion installations & pop performance art tonight, Gaga wrote on the eve of her tour opener.

Click through for photos of Lady Gaga's fans and protesters outside Seoul Olympic Stadium on Friday.

The Born This Way Ball continues May 2 in Hong Kong, with a four night stint, before heading to Tokyo, Japan for three shows.