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7 February 2013, 10:49 | Updated: 7 February 2013, 10:52
The 'One More Night' singer brought along his relative to a yoga session with the teen titan.
Maroon 5 frontman Adam Levine apparently told Justin Bieber to stay away from his cousin after the pair met in a gym recently.
The 'Moves Like Jagger' singer brought along his "pretty" female relative to a yoga class in which the Canadian star was also attending.
The Hollywood Reporter revealed that the teen titan "immediately pulled Adam aside" to ask who she was.
"Adam laughed at how forward he was and said, 'It's my cousin — you stay away'," a source told the publication.
The insider continued: "Justin couldn't stop staring at her, and then he ran over and asked for her number."
The 'As Long As You Love Me' singer recently split from his long-term girlfriend Selena Gomez at the beginning of the year.
The pair are rumoured to have rekindled their romance this week after the Disney actress was seen leaving his LA home after spending the night.
He and Adam also teamed up in the studio last year and teased a new super group called The Whirling Dervishes.