Fergie, 33, is the entertainer in the family. Younger sister Dana, 29, is a teacher.
GISELE & PATRICIA BUNDCHEN
Gisele, 27, has five sisters, including her fraternal twin (and manager) Patrícia.
NICOLE & ANTONIA KIDMAN
"I wouldn't have got through parts of my life without her," Nicole, 40, once said of Aussie TV host Antonia, 37.
JENNIFER & MELISSA GARNER
Jennifer, 36, has said she asks her sisters Melissa, 39, and Susannah, 33 (both moms), for parenting advice.
PENELOPE & MONICA CRUZ
"She's more beautiful [than I]," said Penélope, 34, of actress Monica, 31. (They also have a brother, Eduardo, 23.)
KATHERINE & MEG HEIGL
The youngest of four, Katherine, 29, was maid of honor at the '07 wedding of Meg, 32, who works in a veterinary office.
SIENNA & SAVANNAH MILLER
Fashion designer Savannah, 28, launched the Twenty8Twelve clothing line with Sienna, 26.
MILEY & BRANDI CYRUS
Brandi, 20, one of Miley's five sibs, is a musician and crafted tunes for the 15-year-old star's new record.