I have a potty mouth - Lady Gaga apologises on Radio 1
Lady Gaga had to apologise for her "potty mouth" when she co-hosted the Radio 1 Breakfast Show - where she revealed she has recorded a duet with Florence Welch.
The singer accidentally swore, saying "this is the new shit", while presenting the show with Nick Grimshaw.
"I apologise to those listeners, I have a potty mouth", she said.
Gaga played her new single Perfect Illusion on the show.
And she revealed that she has recorded a duet with Florence and the Machine star Welch.
She said: "There's a feature on the album that I think you will be very excited about. Me and Florence Welch did a duet together.
"I started to work on an idea for a song that I really wanted to do with a girl. You'll see why when you see what the song is about.
"I just thought 'who do I want to sing with?' She's really to me if not the best, one of the greatest vocalists in the world. She's incredible."
Perfect Illusion is the first track from her fifth studio album.
She said that the track was about social media.
"The song is about why there are so many fake things around, things that appear to be real.
"How do we navigate through social media?
"I'm not saying not to use your phone, I'm not that crazy. I think social media is great.
"But there's also a lot of things that are on the internet that aren't reality.
"People feel pressured to that perfect illusion in their real lives. This is about accepting that and letting go."
Lady Gaga only just returned to the studio in time after nipping out to the "garage" to smoke a "clove cigar" during a music break.
"I will quit when I start to do TV and stuff," she said.
"I try to look at things in perspective.
"It's terrible. I have been yelled at by Elton (John), Stevie Wonder, Tony Bennett. The list could go on of amazing, great people who are like 'You need to stop smoking'.
"I get anxiety sometimes and my record is out today and I needed to have a moment alone."
Asked where she smoked, the star said: "In the garage. Am I going to get arrested?"
She added: "I don't smoke cigarettes. I smoke clove cigars."
The singer recorded her new album with producer Mark Ronson.
She said she spent the first day working on the record in tears, because he was so nice.
"The first day in the studio with Mark I cried almost the entire day. I was just so overwhelmed with excitement."
Ronson told Gaga to sit at the piano and sing what she wanted to sing about.
"It was just so overwhelming to have that love and experience I just cried all day long," she said.
Grimshaw later invited Gaga's father, Joe Germanotta, also known as "Papa G", to join them in the studio.
The superstar complained "I'm so embarrassed" and "Oh my goodness, I'm dying", after Mr Germanotta boasted about his daughter's early songwriting skills.
"She was a very childish child to begin with", he said.
"But she was very determined. We could see it in her when she was four. She would stand in front of the piano and just bang on the keys.
"I used to play Money by Pink Floyd. She wrote her first song. It was called Dollar Bill. We still have it."
Gaga said her father still helped her with her music.
"He gives me ideas and encourages me. That's what he did as a kid."
But she added: "I played him a mix in the car (of the new album) and he fell asleep".
The Poker Face singer told fans to visit her father's Italian restaurant, Joanne Trattoria, if they are in New York, to sample the "meatballs", while he also plugged his new cookbook.
"My dad's talking about his cookbook. My single's out today!," Gaga said.
Gaga refused to reveal the title of the new album or when it would be released.
She said of the emotional impact of writing her own songs: "I have a therapist. When I leave the therapist's office I feel really, really great.
"When I'm writing music I don't always feel that way. It's a bit like open heart surgery."
Gaga said she had never visited her vault of clothes belonging to Michael Jackson and other late stars despite spending a fortune on the items at auction.
"I haven't been to it yet because it's going to feel like a funeral," she said. "I'm terrified to see all those pieces lined up."
She said the feeling of releasing the new single was "overwhelming" and like a "rebirth".
"It's amazing. I can't believe that the day has come that the song is out. I've been in the studio for months and months and now it's in the world.
"I'm overwhelmed and in shock today. I'm having a good time."
But she added: "I've had two hours' sleep. I can't sleep right now, man.
"It feels like the first time. Something about this song ... it feels like I'm a new artist."