Actors Jonah Hill and Kristen Bell have added their names to the list of celebrities speaking out against Russia's anti-gay laws ahead of the 2014 Winter Olympics.

Hill and Bell joined pop star Madonna in taking to their social networking accounts to post pictures of themselves wearing the Human Rights Campaign's (HRC) T-shirts featuring the phrase "Love Conquers Hate" in Russian.

Superbad star Hill flashes a big smile in his picture, writing in the caption, "Help us show Russia & the world that #LoveConquersHate."

Bell, an outspoken supporter of lesbian, gay, bisexual and transgender rights, posted a close-up of her wearing the shirt and wrote, "For real: Tell Russia & the @Olympics that #LoveConquersHate."

Campaigners including Kevin Bacon and Jamie Lee Curtis are urging Olympic Commission officials to condemn Russia's laws on homosexuality ahead of the country's hosting of the sporting spectacular next year (14).