Selena Gomez is reading a marriage self-help book ''for fun''.

The 20-year-old singer surprised onlookers last week when she was spotted reading 'The 5 Love Languages: The Secret to Love that Lasts', a tome detailing how to have a happy marriage but Selena insists she and boyfriend Justin Bieber, 18, are not planning to walk down the aisle any time soon.

She told ''Actually my preacher suggested it to me just for fun so I'm reading it just for fun.''

However, things are getting serious for the pair as they recently decided to purchase a plot of land in Tarzana, California, which they will begin building a home together on soon.

A source said: ''Justin and Selena are building a massive home together in Tarzana. It's just a dirt lot right now with some pipes, but it has a generous panoramic view of the San Fernando Valley.''

Justin recently revealed one of the things he likes most about the former 'Wizards of Waverly Place' actress was that she was a good listener.

He said: ''I'm attracted to someone who's a good listener, who is there for me and who pays attention to what I am saying. Also, I'm very affectionate so need someone affectionate like me.''