"Women should empower and encourage other women," she wrote on Twitter. "For that is the only way to truly be 'equal' and have rights..."
She said campaigners should focus on more important issues that affect women, such as female genital mutilation.
"I am very much a feminist. I believe women can do it all and have it all. Women who slag off other women are just jealous and insecure...," she tweeted.
"The real oppression to women is in places where women aren't allowed to drive and are made to (or brainwashed into wanting to) wear a burka."
Former glamour model Nicola McLean said she did not think Page 3 was a "sexual equality" issue.
She told ITV's Good Morning Britain: "It has been going for many years, which is one of the reasons I feel so sad that it has seemingly come to an end.
"I don't think it is outdated. I think the girls still look fantastic on the page, they still clearly enjoy what they are doing, people still want to see it.
"Everybody still wants Page 3, apart from the feminists who are fighting an argument I just don't agree with.
"If you meet any Page 3 girl who has gone on to pose for the Sun, we are all very strong-minded women that have made our own choice and feel very happy with what we are doing.
"We certainly don't feel like we have been victimised."
However, the Sun's apparent decision to ditch its traditional Page 3 photograph prompted a largely positive reaction from campaigners and critics.
The "Page 3" hashtag was trending on Twitter whilst BBC Radio 4 led their news bulletins with the item throughout Tuesday morning.
Several MPs, including well-known Page 3 critics Harriet Harman and Stella Creasy, weighed into the debate.
Emma Reynolds, the shadow housing minister and labour MP for Wolverhampton North East, said it was "brilliant news" while many congratulated Lucy-Anne Holmes, who spearheaded the No More Page 3 campaign.
Others took a more lighthearted approach. Andrew Castle, the BBC presenter, joked that he would miss the "insightful" news relayed by the models each day.
Some critics, whilst cautiously welcoming the development, expressed frustration that the feature would still be available online, whilst others suggested it might simply be a device to boost online subscriptions.
