A source tells British tabloid the Sunday Mirror, "They have a strong chemistry. He is bowled over by Sienna.
"It's as if she's trying to make Jude angry."
Miller, 24, and Law ended their seven-month engagement in July 2005 after the Road to Perdition hunk admitted he had slept with his children's former nanny Daisy Wright the previous March. They have since made numerous attempts to rekindle their relationship.
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