May 08, 2011 08:00 PM

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Today marks a special day for both Bethenny Frankel and her daughter. Not only does the reality star celebrate Mother’s Day, but Bryn Casey also hits a major milestone — her first birthday.

“We usually walk around with my family on the weekends,” Frankel, 40, tells PEOPLE at the Candie’s Foundation 10th Anniversary party Tuesday. “We just walk around downtown and get lunch, so we’ll go to a swing set with Bryn and we’ll go somewhere for lunch.”

However, despite the low-key holiday, the first-time mom and husband Jason Hoppy aren’t ruling out a future birthday bash for baby girl!

“We are planning a party,” she reveals. “I wanted Bryn to have pictures later that she could see and have all the balloons and have fun.”

In sync with her birthday, Bryn is also “standing on her own” and is on the brink of her first steps, reveals Frankel, who adds the mother-daughter duo love making memories together.

“We sing, we dance, we have dance parties, we do bathies every night,” she says. “I’m so in love with her. It’s the most magical thing in the world.”

As for keeping the romance alive with a baby in the house? Plan ahead, suggests Frankel. “It’s not as sexy as you think it’s going to be,” she admits. “You come home and take your blazer off and if you’re already wearing lingerie, it’s easier to give it up.”

— Anya Leon with reporting by Kim Peiffer

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