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"Sorry not sorry" hitmaker, who completed her 90-day rehab treatment for drug overdose a few days ago, is still heavily dependent on her former beau Wilmer Valderrama, to remain sober. A source close to Lovato told tmz.com that Lovato and Valderrama communicate regularly. "She and Valderrama still communicate regularly. Valderrama was a crutch for Demi through her hospitalisation and visited her in rehab too. The two talk several times a week and meet up as well... but it's nothing romantic, simply a supportive friendship." The singer recently left rehab stint, which followed her hospitalisation from an overdose in July. She is now spending three days a week at a sober house, which has counselling staff on hand, as well as people who she can share experiences with.