Forget sibling rivalry, Solange Knowles would rather sing her older sister Beyonce's praises.
Though Solange was the first among the sisters to become a mother, she said Beyonce makes it looks easy with two-year-old daughter Blue Ivy.
"I have never seen anything like it in my life, from anyone. It's absolutely insane," Knowles told the latest issue of online fashion magazine ASOS.
"Now that she's become a mother, and the way that she's able to balance that is so inspiring," said Knowles, who appears on the cover. "If I am ever feeling like I want to open up my mouth and complain about how hard I am working, I think, 'Uhhh! Sit down!'"
The 27-year-old "Losing You" singer is a single mother to nine-year-old son Daniel Julez.
A regular on the red carpet, Knowles also told ASOS that her personal style is changing.
"I might be having a little evolution in my style…it's been a lot more subtle," she said. "I had a bit of print fatigue, it's been a part of who I am for as long as I can remember. But you want to evolve and experiment - that's part of the fun and the joy of being a woman."