Mrs Britnell joined her Liberal colleagues to participate in the Midsumma Pride March in St Kilda on Sunday.

She said she supported the push to legalise gay marriage.

“I believe society is ready for change when it comes to marriage equality and that’s a change I’m not opposed to,” she said.

Mrs Britnell attended the pride match for the first time.

She said she wanted to show her support for the lesbian, gay, bisexual, transexual and queer community.

“Respect, tolerance and treating others the way I wanted to be treated were values my parents instilled in me and they are values I still have to this day,” she said.

“Sunday was a terrific celebration and a wonderful display of the diversity we have here in Victoria.”

Opposition Leader Matthew Guy expressed his support for same sex marriage in 2015, saying the time for equality had come.

"A person's love, no matter who it's toward, should be respected and given the equal level of recognition," he said.

Federal MP Dan Tehan said he was personally opposed to same-sex marriage when questioned ahead of the federal election last year.

He also said he would vote in line with the national result of a plebiscite but it was nuked in November.

Prime Minister Malcolm Turnbull said after the plebiscite was thwarted: “We have no plans to take any other measures on this issue."