Cutest crustacean ever! For Halloween 2012, brand-new mom Drew Barrymore couldn't resist playing dress-up with Olive, her then-one-month old daughter with husband Will Kopelman. As the actress, 37, revealed to Oprah Winfrey on the Sunday Jan. 20 episode of Oprah's Next Chapter, Barrymore doesn't go a day without checking out a particularly precious photo (and video) of her little girl from Halloween last year: In which Olive is decked out as "lobster the pot."

"It's the best picture ever!" the Big Miracle star gushed to Winfrey, holding up her iPhone during their sit-down. Indeed, motherhood has utterly transformed the former child star, who wed Kopelman in June 2011, giving birth to Olive in September.

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"It's like having the worst crush of your life!" Barrymore explained. "I drive home with heart palpitations, like, I can't wait to get to her. I think, 'You know, is she gonna call? Will she ask me to spend the night?'

Continued Barrymore, who was previously "not a morning person" : "I wake up every morning . . . and it's a newfound joy that I have in the morning hours . . . I get to wake her up, and she's so fun and always smiling and doesn't have this history of all these thoughts you wake up with as an adult . . . It's just joy!"

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One aspect of modern motherhood the Cover Girl spokeswoman isn't interested in? Any focus on post-baby weight loss. "I want nothing to do with that hamster wheel from hell," she says. "It seems miserable. I want to be healthy enough that I feel good mentally."

Her feel-good secret: "I just know that if I make my husband laugh -- I think that's why my husband loves me --if i make him laugh, I feel like the most beautiful woman in the world."

Touching upon touchier subjects, the former ET star also acknowledged to Winfrey that her long-estranged mother, Jaid, did not attend her wedding. "She was not there actually, which was really hard," said Barrymore, who was legally emancipated from her mother as a teen. We both discussed it and thought it would be best. We really spoke about it -- that's where I feel like a grownup, with my mom."

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Indeed, Jaid has yet to meet her grandchild, either "We've only been in Los Angeles, we haven't traveled with [Olive] yet," Barrymore explained.

This article originally appeared on Drew Barrymore Shares Picture of Daughter Olive in Lobster Costume