Doting mum Bey swung the three-year-old from side-to-side, with Sir looking extremely dapper in a miniature Giorgio Armani suit and a rainbow unicorn headband.
Filmed by Bey's pal and stylist Manuel A Mendez, the songstress couldn't help but beam as the tot clung onto her neck.
Sir has a twin sister, Rumi, as well as older sister Blue Ivy, eight.
Beyonce shares her three kids with rapper, entrepreneur and hubby Jay-Z.
Manuel has worked with the Carter family for years, and has been styling Blue since she was a baby for public appearances with her mega-star parents.
