Drew Barrymore in Oprah Winfrey Show

Drew Barrymore has a way of making the expression "best friends" sound like something a lot more than that – especially when she and boyfriend Justin Long showed up on Oprah Winfrey's show Monday fresh out of the shower. "We used the hotel shampoo," a giggling Barrymore, 33, told Winfrey, explaining why she smelled so good. The talk host already deciphered why the actress-producer emanated a special glow: it was because of Long, who sat in the audience. His hair was wet, too. "She smells good," Long, 29, told Winfrey when she asked what he liked about Barrymore. "She's beautiful," he said, "and funny. The most compassionate person I've ever met." In reciprocation, Barrymore, explaining that "when you grow up … you decide what you want to be," said her relationship with Long was "healthy, productive, supportive and full of humor." In all, she said, they're having an "excellent time."