Katy Perry Talks Rihanna's Marijuana Use

Katy Perry, the 28-year-old singer and songwriter, has had a public friendship with singer Rihanna and recently revealed that she questioned the latter about her marijuana smoking ways.

"I think that Rihanna always looks so fresh and I'm like, 'How do you do that? We all know how much pot you smoke," Perry laughed recently during a recent interview with Elle Canada. "And you don't sleep because you're on Instagram at four o'clock in the morning!'"

Perry's statements came after she was questioned about how she manages to reduce her own stress.

"I learned this thing called Transcendental Meditation," she told Elle Canada.

The singer has maintained her friendship with Rihanna, the 25-year-old Barbadian recording artist, for years and revealed her feelings about the singer in an issue of Elle U.K. earlier this year.

"I love her [Rihanna] and every time I see her, I'm reminded of the light that she has," Perry told Elle U.K. "There's a lot of dark in this business...I know a lot of people out there with the most detrimental entourages - they are the root of their demise."

While she didn't name anyone specifically, Perry insisted that she was finished saving high profile public figures.

"It's really unfortunate but you can't save these people," Perry told Elle U.K. "My days of celebrity saving are over."

Earlier this year, Rihanna, 25, and Perry were the subject of reports that the latter disapproved of a reconciliation with ex-boyfriend Chris Brown who physically abused her in 2009.

"They're barely talking and ever since the couple reunited, there has been tension between them..." a source previously told The New York Daily News' Confidential. "Katy fears Rihanna is making a huge mistake and doesn't want to be part of it."

Rihanna previously laughed off rumors that she and Perry were at odds over the former giving her friend relationship advice.

"Katy Perry can date anyone she wants," Rihanna said in a Now Daily report last May. "Besides, who the (expletive) am I to say anything? I could never give relationship advice to anybody!"

An Us Weekly source reported that Rihanna and Perry reunited with one another last May after some time spent apart.

"They hung out like old times and were catching up," the source told Us Weekly last May.