Beyoncé wore one of Beckham's blue pieces when she attended an event organised by Michelle Obama earlier this week.
"She was one hot mama, for sure," Beckham told Extra. "I mean, Beyoncé is absolutely beautiful and has the most phenomenal body, she really does. She looks great, she really does.
"I was very excited when I saw it online. I screamed! I was like, 'Look, David, look!' I still get so, so excited. She's incredible and also an artist that I have so much respect for. I'm a huge, huge Beyoncé fan. It was big for me."
Beckham also revealed that she is feeling "really, really overwhelmed" by the success of her fashion line.
"I feel proud of myself, proud of my team," she said. "And I just want to make women feel good about themselves. I want to empower women. I want to make them feel happy and confident and as long as women are out there buying the dresses, I'm going to carry on doing what I feel really, truly blessed to do."
Beckham described herself as the "luckiest girl in the world", adding: "With David and with the kids and with my job I'm very appreciative, I really am. Very blessed."
> Victoria Beckham: 'I love fashion too much to wear a tracksuit'
Watch Victoria and David Beckham talking to Extra below: