The American Horror Story: Hotel actress has been working with Ronson in London this week according to Lily Allen, who stated during a red carpet interview Monday the producer cancelled studio time with her.
"I know that Gaga's here, 'cause I was meant to be in the studio with Mark Ronson tomorrow and he canceled on me because Gaga's here," she told E! News.
Award-winning producer Ronson has worked with such artists as Amy Winehouse, Bruno Mars and Adele. Gaga -- real name Stefani Germanotta -- most recently worked with Nile Rodgers and Tony Bennet on "I Want Your Love," and the album Cheek to Cheek, respectively.
In addition to her musical ventures, Gaga has been named the latest guest editor of V Magazine's January issue. The project will focus on collaborative art with art and fashion leaders as Nick Knight, Steven Klein, Inez and Vinoodh.
"This issue of V is about all of these people coming together to express a passion for art and fashion, to really 'go there' to make a great statement and to change things," Gaga is quoted as saying about the issue.
"I feel like we all share an appetite for living a life of passion and creativity...it's like we all found our immortality through art and fashion...we share that deep spiritual place," the magazine covergirl added.