John Mayer and Katy Perry Board Tour Bus Together—See the Pic

Songstress joined her boyfriend as he headed to a show in Long Island

Katy Perry is clearly John Mayer's No. 1 fan.

So much so, it seems, that the "Roar" songstress decided to join her man on his tour bus in New York City as he made his way to Long Island for a show on Wednesday.

A source tells E! News the duo was seen leaving the SoHo Hotel with a small security team. Mayer had some guitars and Perry had a small backpack.

Of course, this is just the latest example of the gal being an awesome girlfriend.

After all, the song "Who You Love" on Mayer's just-released album, Paradise Valley, is a duet between the two.

Earlier this month, Mayer told Billboard that the general idea behind the song can be best described as, "I love you based on the fact that I've tried to run and I'm not running and I give up."

He added that his girlfriend wrote the lyrics to her part of the song herself and said "it was a really fun opportunity for her to write like, her answer to that."