Beyoncé, who announced in August that she and husband Jay-Z are expecting their first child, will give birth in February 2012.
Knowles, who is mother to 7-year-old son Julez, has expressed her excitement at becoming an aunt and switching roles with her older sibling.
"My sister is a phenomenal aunt, so I'm ready to be the same in her life," she told US Weekly.
"I don't need any advice [on how to be a great aunt]. Because she has been a phenomenal aunt to my son, so she's set the tone as an aunt. I've set the tone as a mum, so we're learning from each other."
Beyoncé recently said that she and Jay-Z did not do a good job hiding the singer's pregnancy as she found it difficult to hide from the public.
Earlier this month, former Destiny's Child bandmate Kelly Rowland was thought to have revealed the sex of Beyoncé's baby after referring to the child as "she" in an interview.
See Beyoncé and Solange Knowles in the video for 'Party' below: