Sources in Hollywood claim that Oscar hopeful Joaquin Phoenix, 31, and party girl Lindsay Lohan, 19, are embroiled in a clandestine romance! Both stars are renting bungalows at LA's luxe Chateau Marmont, and sources say a hot romance between the two has been happening behind those chalet doors!A source close to the "Walk the Line" actor says the romance is happening, but it's nothing serious. The source says, "I think Joaquin is blowing off steam with Lindsay. This is definitely not going to be a great Hollywood romance."

The source also pointed out, "Lindsay is way too young for him." Even though the "Herbie: Fully Loaded" star has dated a string of older men, including Wilmer Valderrama, 25, and, until recently, Jared Leto, 34. Lindsay is not even old enough to drink legally.

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