The former Wanted star is keeping a watchful eye over the 28-year-old actress as she performs in play 'Speed-the-Plow' in London because he wants to help the flame-haired beauty - who has struggled with alcohol addiction in the past - stay on the straight and narrow.
Tom, who grew close to the 'Mean Girls' star while she dated fellow The Wanted member Max George, reached out to Lindsay after he spotted a photo of her ''staggering out of a club'' following a night of partying.
He told The Sun newspaper: ''I chatted to her a couple of days ago because I saw a photo of her in a newspaper staggering out of a nightclub.
''I wanted to check she was okay so I asked what she was doing. She told me she had simply fallen over and I was like, 'Really?' ''
The 26-year-old singer admitted he worries about Lindsay - who was arrested twice for driving under the influence in 2007 - and is rooting for her to keep her life on track.
He said: ''She's had a rough time but she's a sweet girl and a great actress. None of us want to see her go back to that dark place.''
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