Social media users are being urged to smear lipstick across their cheeks and post selfies of the results on social media as part of a cervical cancer awareness campaign.
The SmearForSmear drive is being launched by charity Jo's Cervical Cancer Trust as figures show that more than a million women failed to take up the offer of a smear test in 2013-14.
Those who share their lipstick smeared selfies on Facebook, Twitter and Instagram should then nominate one or more friends to do the same.
Robert Music, chief executive of the Trust, said: "Every day we see the devastating impact a cervical cancer diagnosis can have on both a woman and her loved ones.
"But to know that, for those that delayed their screening before diagnosis, this could have been prevented is tragic. It's now time that we see an upward shift in awareness of cervical cancer and an understanding of the importance of smear tests."
Data released last year showed that the uptake of smear tests is lowest among younger women.
Although screening coverage for women aged 25 to 29 had increased to 63.3% on March 31 last year from 62% in 2013, it was still "considerably lower" than in any other age group.
Professor Julietta Patnick, director of NHS Cancer Screening Programmes, said: "It is evident that women in this younger age group still need encouragement to be screened and Public Health England is working hard to address this with research underway to investigate new ways of improving cervical screening uptake among younger women.
"Regular attendance at screening remains the top preventative measure against cervical cancer and we would encourage all women to make the decision to attend when invited."
What you need to to know about cervical smears:
All women aged between 25 and 64 are invited for cervical screening every three to five years
The procedure is used to detect abnormal cells which, if left untreated, could lead to cancer in the cervix
Screening coverage - the percentage of eligible women recorded as having been properly tested at least once in the last five years - has been falling
On March 31 2014, the figure stood at 77.8%, down from 78.3% a year earlier and 80.6% a decade ago