"All the talk of Bradley was all in fun; she's ready to dispel those rumours once and for all," a source told Entertainment Tonight.
Over the weekend, Lady Gaga stepped out with her boyfriend Dan Hortin, putting an end to the speculation about her relationship with the actor.
The couple were seen sharing a passionate kiss on the balcony of Studio City's Granville restaurant.
A restaurant-goer at Granville told People that the couple were "kissing as they spoke really close up."
"She had a table in the front near the sidewalk, so she was clearly okay with being seen. She seemed very happy when interacting with the guy she was with."
During their raunchy make-out session, the Grammy winner appeared to be braless under her black vest shirt, and her hotpants provided a view of her bottom cheeks.
Another source said "She seemed confident and in a good place."
"Gaga has real chemistry with Dan," a source close to the singer has told Entertainment Tonight.
"They have been seeing each other for weeks and have been working with each other for a while. They have been working on new music, have spent hours of work time together and became really close."
The Nashville-based engineer has a penchant for performers and was previously married to Broadway star Autumn Guzzardi.
Radar revealed that the couple got divorced in April last year after five years of marriage, citing "irreconcilable differences" as their reason.
Horton's ex-wife reportedly slammed Gaga in a new Instagram post, posting a photo of herself posing like a model, and writing in the caption, "Poker Face" as a play on Lady Gaga's hit song.
This is the first relationship Lady Gaga has entered since breaking off her engagement with Christian - who she was with for two years.
During her Las Vegas show, the 33-year-old opened up about the breakup, saying "So, last time I sang this song, I had a ring on my finger," she said on stage. "So tonight will be different."
Horton has worked alongside the Oscar winner since November 2018, before her Las Vegas residency.
"He is handsome and talented and she likes to date men on her team... she is known as a workaholic, so it fits her lifestyle to meet someone while working," a source told Entertainment Tonight.
According to his LinkedIn page, Horton owns a company called Audio Engineering Consulting Group and has previously worked with other stars such as Camila Cabello, Bruno Mars and Justin Timberlake.