United Kingdom, Feb. 28 -- Demi Lovato has become "accustomed" to partying without alcohol.

The 33-year-old star has been open about her past addictions to alcohol and drugs and says it is now "second nature" for her to hit the town without feeling the need to drink.

Demi told People: "I've just become so accustomed to it that it's second nature for me. I haven't drank for so long, so I don't even remember what it was like going out drinking."

The Here All Night singer explained that she surrounds herself with "the right people" on nights out.

Lovato said: "I would never go out without my friends. I think that would probably make me a little anxious.

"I like to avoid having social anxiety as much as possible, so making sure you have ...