Time to paint Graceland pink!

Elvis Presley's only daughter, Lisa Marie, is now a doting mom to 3-month-old girls Finley and Harper – and she is showing off her tiny additions in the new issue of PEOPLE.

"I really wanted these babies," says Presley, 40, who tried for two years to get pregnant before conceiving the twins.

"My blood was too thick and would clot, which caused several miscarriages," she tells PEOPLE. "The moment I took blood thinners, I got pregnant."

Presley and her guitarist husband Michael Lockwood, 47, also share their L.A. home with Presley's children from a previous marriage: daughter Riley, 19, and son Benjamin, 16.

Life as a bustling family of six is "chaotic bliss," says Presley.

The outspoken star – who proudly bared her baby bump after tabloids accused her of having an "unhealthy appetite" – also opens up about losing her baby weight.

"I was unable to see my toes by the fourth month," she admits. "But I only gained 30 lbs. total. I worked out up until the seventh month."

For much more on this story, check out the new issue of PEOPLE, on newsstands Friday