Lindsay Lohan has confessed that she had her last drink after leaving rehab.

The starlet - who has been appearing in a reality show on Oprah Winfrey's TV network which follows her return to sobriety - is now on the straight and narrow but revealed on Alan Carr's Chatty Man that she had a little wobble after receiving treatment last year.

Asked when she last had a drink, Li-Lo said: "I don't know - a long amount of time.

"I mean there was a point on the show when I was in a relationship with someone, and I, like, had a drink and I freaked out and didn't want to say anything on the show as I didn't know how that would come across and I was just scared."

The 27-year-old Mean Girls star went on: "And that's when it kind of hit home that I was doing a docu-series, and I was like you know what, I'm honest and I'm open and I've never really hid anything. Unfortunately there are some things I would've like to have kept hidden that have been out there."

The star began taping the reality show, Lindsay, shortly after leaving her sixth stint in rehab last summer.