Nicki explains to MTV how the (female fan) boob signings started and how it transformed into virtual signings on her twitter.

After the jump, she talks about how estatic she was when she heard that Jay-Z personally recommended her to Robin Thicke for “Shakin’ It 4 Daddy.”
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Obviously, Jay-Z … Jay-Z is a person in hip-hop that you almost don’t think he exist until you meet him. It’s almost like he’s bigger than a person. He’s a mythical figure. That’s a great way to describe it. I was like, ‘Jay-Z knows me?’ I didn’t think he knew who I was, let alone recommend me for something. If he did know who I was, I didn’t know if he liked my style or approved. It was weird. It was like getting that stamp of approval from the most popular jock in high school and being a freshman in high school and thinking no one knows you exist.

He saw me perform it with Robin at Robin’s release party. It was scary — him and Beyoncé were there, literally a few feet away from us watching us perform in New York. They loved the performance. Beyoncé was so into it. I never saw her act like that. She was like, ‘You killed it.’ It was just a crazy experience — that whole night, even being tied to somebody like Robin. I wouldn’t expect him to want to make a record like ‘Shakin’ It 4 Daddy.’ I’m just happy to be a part of the project and I’m glad it came from Jay. I don’t think Robin really knew me. When Jay said that, he probably was like, ‘Really?’ and researched me. Then I think he saw me in the ‘Five Star’ video and got an idea of who I was. If it didn’t come from Jay, he probably would have been like, ‘Who? Never heard of her.’