HP CEO Meg Whitman says she changed her mind on the issue of gay marriage after “careful review and reflection.”

Whitman was among the more than 80 Republican leaders who signed an amicus brief to the Supreme Court in support of a suit challenging the constitutionality of Proposition 8, California's 2008 voter-approved constitutional amendment limiting marriage to heterosexual couples.

(Related: Meg Whitman, Jon Huntsman join other Republicans in support of gay marriage.)

During her 2010 California gubernatorial campaign, Whitman expressed her support for Proposition 8.

In a blog post Tuesday, she explained that she had reversed her stance on the issue “after careful review and reflection.” “Like several others who have either sought or held public office, including President Obama, I have changed my mind on this issue,” she said.

Remarks by British Prime Minister David Cameron “struck an immediate chord with me,” she said, referring to Cameron once saying, “Society is stronger when we make vows to each other and support each other. So I don't support gay marriage despite being a conservative. I support gay marriage because I am a conservative.”

The Supreme Court will hear arguments in the case next month and is expected to hand down a ruling in June.