Jessica Simpson Busts Out: Photo
06/23/2012 AT 02:00 PM EDT
Not that she seems to be anything but comfortable in her skin – hot momma alert!
"Just taking a walk around the block," she Tweeted Friday, alongside a rather revealing snapshot – is that a pedometer in her cleavage? "Street legal???"
Since welcoming daughter Maxwell Drew with fiancé Eric Johnson May 1, Simpson, 31, hasn't shied away from talking about her post-baby, um, assets.
"She latched on at the very beginning. Nursing is a full-on job," she previously told PEOPLE of breastfeeding. "Sometimes I worry she's not getting enough, but it's been an amazing experience."
Simpson added: "It's the worst if I have to pump and give Eric a bottle to give her. I miss holding her and having that closeness."
For now, her fitness motivation doesn't have much to do with the scale – or showing off those curves at the beach.
"It would be nice to feel comfortable in a bikini, but that's not my goal," Simpson, who is working with Weight Watchers to get back in shape, told PEOPLE. "I just want to fit into jeans!"