Katy Perry and boyfriend John Mayer celebrated his 35th birthday today with a romantic lunch at ABC Kitchen in New York City, and the lovebirds made no attempt to hide as photographers snapped away.

The two first started dating in June, and despite those split rumors back in August, they've been spotted out together numerous times in NYC and LA. After their brief break up, a source told the NYDN, "She's been really depressed and needs attention. She really liked him and thought it was going to be something serious."

The source added that Perry had been drunk texting Mayer to win him back ... looks like it worked!