"They had to, like, tape it and stretch (a bra) around into my a** crack. It was quite funny. It's all very glamorous." Robert Pattinson filmed an embarrassing sex scene with Emilie De Ravin in new movie "Remember Me" after the costume department forgot to buy him a "modesty patch."

Meanwhile Robert and his rumored girlfriend Kristen Stewart stunned revelers at a small London gig on Wednesday night by turning out to watch the actor's sister perform. The news comes just days after the pair was allegedly spotted kissing in a London pub.

The actors have constantly dodged questions about their love lives, but now Pattinson has allegedly announced he's dating the star.

He reportedly told Britain's The Sun newspaper, "It is extremely difficult but we are together, yes. We can't arrive at the same time because of the fans. It goes crazy. This was supposed to be a public appearance as a couple but it's impossible. We are here together and it's a public event but it's not easy. We have to do all this stuff to avoid attention."

See more photos of "Remember Me" here!