The 29-year-old actress was recently the subject of some untrue pregnancy rumors.
The actress looked fabulous wearing a short white skirt with a chic black top.
Johnson looked slender as she added high-waisted black leggings to her look and carried a light pink sweatshirt and brown purse over her shoulder.
"I think I kind of crashed your birthday party", Johnson admits to the 60-year-old daytime talk show host.
The Social Network star giggled with a male pal before taking a seat outside on the patio. For Dakota Johnson, it merely resulted in a slew of headlines and some awkward reactions.
The balloon release led many to believe that the party was a gender reveal party for Johnson's supposed pregnancy. Onlookers spotted a bunch of blue balloons let up in the air and immediately presumed she is pregnant with a boy. She further explained the mystery behind the blue and pink balloons.
"Well, the only thing I'm pregnant with is a lot of really good ideas, but not any babies", Dakota said when asked if she is pregnant.
"Now I had to be like, 'It was just my birthday, ' and all the people that I didn't invite know that I had a birthday party", Johnson lamented.
In fact, even though Dakota is very private about the relationship, Ellen even got her to dish about her man a little bit during the interview. "But I am very happy".
Dakota and the Coldplay frontman have been dating since last October after they met through mutual friends.
Chris is already a dad of two - Apple, 14, and Moses, 12 - with ex-wife Gwyneth Paltrow.