Justin Bieber Leaves Valentine's Day Visit 'Really Inspired'

Meeting 'Mrs. Bieber,' a 6-year-old fan battling cancer, 'one of the best things I have ever done,' teen superstar tweets.

Justin Bieber spent the day before Valentine's Day with a special girl. No, he wasn't with his lady love, Selena Gomez — instead he visited Monday with a 6-year-old Belieber, Avalanna Routh, who is suffering from an aggressive form of cancer.

In a photo posted to his Twitter account, Bieber is seen hanging out with the young fan, dubbed "Mrs. Bieber." And the experience seems to have really affected him. "Hangin out with a special little girl. #MrsBieber," he tweeted about the meeting. "That was one of the best things i have ever done. She was AWESOME! Feeling really inspired now! #MrsBieber."

Avalanna's dream came true after her family started a Facebook campaign for her to meet Bieber, which, along with her pretend marriage to the teen superstar, was reported by a Boston-area news outlet. When the always-charitable Bieber caught wind of the marriage and her family's efforts, the "Today" show reports, he flew Avalanna and her family to New York. The 6-year-old, whose "marriage" to Bieber was orchestrated by the charity the Jimmy Fund, has had an incredibly rare form of cancer called AT/RT since she was a baby.

"Got some really great ideas from today. ways to #giveback. #MrsBieber really inspired me. Really," he said, adding, "BEST PART OF MY DAY."

Bieber is involved with several charities through his [article id="1673555"]Believe charity drive[/article], including [article id="1674628"]Pencils of Promise[/article], the organization started by Adam Braun, brother of his manager Scooter, that builds schools for children around the world.

The pop star also made headlines recently when he tweeted about a fan who needed an [article id="1677905"]organ donation[/article], skyrocketing registrations at the Trillium Gift of Life Network donor bank in Ontario, Canada.