Blake Lively: I’m Still Getting Used to My Breastfeeding Boobs

04/29/2015 at 04:30 PM ET

Blake Lively Breastfeeding Boobs
Startraks Photo/REX

Being a walking Denny’s can be difficult.

Since welcoming daughter James in December, Blake Lively has been happily breastfeeding her baby girl. But now that she’s promoting her new movie, The Age of Adaline, the new mama has found that┬átaking her nursing routine on the road has its own set of booby traps.

“With all the wardrobe changes, one thing I hadn’t accounted for was that I didn’t have time to pump,” Lively, 27, tells PEOPLE exclusively.

“So my proportions definitely started to, shall we say, increase throughout the day.”

And with limited time to tailor her ensembles, the actress jokes that her ever-changing chest nearly caused a fashion fail — live on TV!

“I walked out onstage for one appearance in an outfit that had fit perfectly when I tried it on many hours earlier, but by the time it got on me, I thought, ‘Oh, no! This isn’t going to cover them up at all!’ ” she admits.

“I was very worried about a wardrobe malfunction,” she adds.

Somehow we’re sure our hair idol┬ástill looked perfectly poised and glamorous.

For more from Blake Lively, pick up the latest issue of PEOPLE, on newsstands Friday.

— Andrea Park with reporting by Kate Coyne

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Showing 17 comments

ImALadyToo on

Is there a reason why grown women feel the need to use the vulgar term “boobs” instead of breasts?!

please on

please–we have to hear about her breastfeeding. like she’s the first. oh, bow to the first ever…

Tracy on

I liked her on Gossip Girl, but that’s all she was good for. Her new movie coming out sucks, because she’s a bad actress, and she is completely overrated. She should stick to commercials and modelling. She’d be a nobody without Ryan.

Ami on

Cute story.

Bonnie on

Another Gweneth Paltrow in the making. She really thinks highly of herself, doesn’t she ?

Tracy on

We’re all adults, they are breasts, not boobs.

Emily on

Not necessarily @Tracy…there are many juveniles who comment here as well and who are probably giggling uncontrollably over the word “boobs”!

Barbara on

Whatever!!!!! Who cares if she calls them boobs, breasts, t**s or whatever! Also, just because she’s commenting on a specific situation, what about that comment makes it sound as though she thinks she’s the only one who has ever breastfed? WHAT IS WRONG WITH YOU PEOPLE?? You are all rotten, nasty, sour bit**es. I’m glad I don’t know anyone like you.

You did it wrong on

For a family that has spent the last few months publicly declaring that they don’t want to talk about their baby, they sure do spend an awful lot of time talking about their baby…

Pam on

Love her dress! She looks gorgeous.

cb on

i agree with the comment – for someone who talks about privacy they sure talk about the baby alot. AND too many personal details. wont suw pics of baby but wont shut up about her.

Jane on

well she does have the riduculous plastic boobs, so yeah…

Marine on

Boobs Boobs Boobs Boobs Boobs now can some of you stop actin gall high and mighty about a freaken word? you are the one who needs to grow up! @barbara totally agree with every single things you had to say!

mer on

Barbara, I came looking for a comment like yours. So much negativity, so much judging. So she says boobs. It’s her personal humor. And she’s describing her experience, she doesn’t act like she’s the first mom ever. Why are you people then reading these articles. Of course there won’t be anything new. But nobody’s forcing you to read it, let alone comment on it.

NV on

She seems changed a lot since she is with Ryan.

Anonymous on

Correct me if I’m wrong, but I don’t think they ever said they don’t want to talk about their baby (and seriously, what parent DOESN’T want to gush about their baby!). They just don’t want to release photos (and didn’t want to release her name right away). I don’t see what’s wrong with that!

Cat on

Sounds like an every day working Mom struggle. I love that she is candid like this even when she knows people will find a way to throw it back at her. Nursing is a blessing and a curse all in one. I’m glad she is so into it and I feel her pain – literally – from having to make clothes fit and try to squeeze in pumping where she can now that she is back to work.