"I feel more beautiful than I've ever felt because I've given birth," says PEOPLE's 2012 World's Most Beautiful Woman. "I have never felt so connected, never felt like I had such a purpose on this earth."
The "Crazy in Love" singer, 30, and her husband of four years, Jay-Z, 42, have gone gaga for Blue, born Jan. 7 in New York City. "She's just the cutest thing," gushes Beyoncé, who croons one-of-a-kind tunes to her daughter and professes to "love" changing diapers.
So who does her daughter most resemble? "She looks like Blue," says Beyoncé, who is back to her pre-pregnancy weight and gearing up for her first post-baby concerts, Memorial Day weekend at the Revel Atlantic City. "She's her own person."
"The best thing about having a daughter is having a true legacy," she adds. "The word 'love' means something completely different now."
For more of Beyoncé's exclusive interview – in which she shares her beauty secrets, reveals how she lost the baby weight and sets the record straight on all the rumors – pick up this week's special issue of PEOPLE, on newsstands Friday