Natalie Cole says Whitney Houston is "doing great" in rehab.
Cole tells "Access Hollywood" Houston "has a great desire to get healthy and get well."
Cole has battled her own drug problems, and she says Houston is on the road to recovery.
Cole, Houston and Dionne Warwick will go on tour this summer in Germany. Cole says she said yes to the tour because Houston is her buddy. She says she's always thought of Houston as her little sister and she feels good that Houston asked her to come along.
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