Chad and Rob Lowe

Tamera and Tia Mowry

Serena and Venus Williams

Ashley and Wynonna Judd

Lindsay and Ali Lohan

Beyonce and Solange Knowles

Nick Carter and Aaron Carter

Alec and Steven Baldwin

Prince William and Prince Harry

Mark and Donnie Wahlberg

LaToya, Michael and Janet Jackson

Monica and Penelope Cruz

Mark Ronson, Charlotte Ronson and Samantha Ronson

Brooke and Nick Hogan

AnnaLynne McCord and sisters Angel and Rachel

Noah and Miley Cyrus

Dannii and Kylie Minogue

Julianne and Derek Hough

Kendall and Kylie Jenner

Joel and Benji Madden