Mary-Kate Olsen says she and twin sister Ashley were like "little monkey performers" during their time in front of the cameras on "Full House."
The unique childhood forged an even deeper bond between the two, but it all seems strange in retrospect, she said.
"I look at old photos of me, and I don't feel connected to them at all," Mary-Kate told Marie Claire magazine. "I would never wish my upbringing on anyone... but I wouldn't take it back for the world."
Mary-Kate and Ashley were ranked 11th on Forbes list of wealthiest women in Hollywood in 2007, with their net worth listed as an estimated $1 billion. Originally built on movies, their empire now includes clothes, hair care products and merchandising, as well.
The former child stars have been there for each other through all the ups and downs and are still each others biggest supporters.
"Sometimes Ash and I have to bring each other back, or push each other more," she says. "It's really helpful to have another half; we're constantly checking in with each other."
Now the 24-year-old siblings are focused on their fashion lines, Elizabeth and James, The Row and JCPenney's Olsenboye. Mary-Kate takes her designs very seriously and spent a "year-and-a-half to make the first T-shirt."
But Mary-Kate hasn't ruled out acting again.
"I still read scripts, and if something great comes along, that's great... but [The Row] is my day job," said the actress who has a role in Beastly, a horror film due out in 2011.