The reality star's lavish 21st birthday ... with a five-tier Barbie birthday cake, a guest at the party tells PEOPLE. “Everyone toasted her with champagne and sang ‘Happy Birthday ...

Mattel Inc.; Chesnot/Getty Happy birthday, Barbie ... nicely with the timing of International Women's Day. Barbie is the original girl empowerment brand. It's a huge proponent of celebrating ...

She's beloved by kids, even if they chop her hair, color her face and tear off her head. She's Barbie: The doll that's launched the imaginations of millions of girls − and maybe as many think pieces ...