After months of speculation, she was finally heard introducing John Mayer as her 'boyfriend' Wednesday night.
And Katy Perry certainly looked like one smitten kitten the following evening as she and John went on a date to a Rolling Stones concert in New Jersey.
While they were clearly enjoying the music, the couple were more interested in each other.
As well as gazing adoringly at one another, John was spotted whispering sweet nothings into Katy's ear.
Katy wore a cute skyline printed top with a patterned blazer for the performance while John sported a casual jacket and shirt.
The Your Body Is A Wonderland hitmaker even joined the band onstage to perform with them during their hit Respectable.
A series of posts on The Rolling Stones' official Twitter account read: '#StonesNJ Respectable 'Take it away John!' Incredible @johnmayerguitar solo
'John Mayer! Take a bow John, fantastic! Thank you!' #StonesNJ@johnmayer (sic)'
Earlier on Katy had bundled up in a beige coat to go Christmas shopping in New York.
'John Mayer! Take a bow John, fantastic! Thank you!' #StonesNJ@johnmayer (sic)'
Earlier on Katy had bundled up in a beige coat to go Christmas shopping in New York.
The 28-year-old pop star combated the Big Apple's 39-degree temperatures by covering up her famous curves in a large beige wool overcoat with leather sleeves.
Despite a full face of make-up, the usually outrageous songstress looked positively understated in her floral scarf, grey skinny jeans, black cowboy booties.
Katy also opted for a large overcoat Wednesday night when she and the 35-year-old blues singer treated his retired high school principal father for dinner at Sardi's.
The Firework hitmaker, who earned a Grammy nod for Wide Awake, looked far more colourful in the needlepoint-inspired Dolce & Gabbana outerwear and teal booties than her neutrals on Thursday.
The trio then headed to the Lunt-Fontanne Theatre to check out the Broadway musical production of A Christmas Story.
After the music, they went backstage to pose for pictures with the show's child-filled cast, which was precisely the moment when Perry decided to make their pairing official.
According to Us Weekly, a witness then overheard the singer say: 'Come on, baby, let's take a picture.'
The on-off couple seem thrilled to spend their first Christmas together after a brief split in August.
Katy split from ex-husband Russell Brand last December after just 14 months of marriage, and she admitted the experience had made her realise she is the only person who can make herself happy.
She told the Daily Mirror newspaper: 'I've learned I'm in a very modern fairy tale. But I also know I don't need the Prince Charming to have a happy ending. I can make the happy ending myself.
Being in love is the dream. But the reality of making it work is not like the movies.'
Since the split, the raven-haired stunner has been linked to male model Baptiste Giabiconi and Florence And The Machine guitarist Rob Ackroyd.
Meanwhile, Mayer has a notorious reputation for loving and leaving some of Hollywood's most eligible ladies, including Taylor Swift, Jessica Simpson, Jennifer Aniston, and Jennifer Love-Hewitt.
source:dailymail