Katy Perry had some words of praise for Rihanna. Explaining all the hard work she does for her beauty regime she noted with surprise how Rihanna managed her looks even with all the "pot" she smokes.

In an exclusive interview with Elle Canada, Katy Perry pointed out that not everyone does a workout for 30 minutes every day, even though it is recommended for good health. She then wondered about Rihanna's looks.

“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!" Elle quoted Perry.

Katy Perry has her own beauty regime that she follows though. She has to be in good shape to promote her upcoming album "Prism." The album is available for pre-order and will be launched by October 22. Meanwhile fans can checkout her beauty regime examined below.

Green Tea:

Katy Perry has reportedly switched to drinking green tea, and it appears that lattes are out. She joins a long list of celebrities who take green tea. Jennifer Lopez, Rachel Bilson, Fergie and Gwyneth Paltrow reportedly take green tea.

Green tea has some health advantages according to health experts. It is believed to induce weight loss by increasing metabolism. It can also help fight bad cholesterol, high blood pressure and depression.

The green tea regime could keep Katy Perry looking young a little longer.

Vitamin C Supplements:

Katy Perry apparently takes vitamin c supplements too. Many of the celebrities in Hollywood swear by it. Some of them are said to go extreme by taking the supplements intravenously.

Health experts believe a natural source of vitamin c is much better. Bell pepper, lemon and oranges are a good source. The supplement is said to help repair damaged skin, lighten the shin tone and may reduce sunburn.

Transcendental Meditation:

Katy Perry reportedly does Transcendental meditation. It is a form of meditation where a person tries to relax and clear the mind of all thoughts. This is achieved by sitting with the eyes closed and chanting a "mantra" or word repeatedly.

Katy Perry says that she does this every other day. It can be used as a great stress buster. One of the beauty tips experts give frequently is to get enough sleep and relax as much as possible.

Katy Perry was astonished with Rihanna's looks also because she seems to be up at four in the morning on her Instagram.