Rebel Wilson had her toenails "glued" back on in between filming love scenes for 'Isn't It Romantic'.

Rebel Wilson

Rebel Wilson

The 38-year-old actress stars opposite Liam Hemsworth in the upcoming movie and she tried hard to conceal the pain she was in during their intimate moments after suffering an injury while shooting a stunt.

She said: "I just admitted to Liam this morning something very embarrassing that happened to me in the scene where Liam comes out of the shower and I'm in bed. Um, two of my toenails had come off because of a stunt earlier in the week, and in between takes, my makeuup artist was supergluing them back onto my foot because I then had to run out of the bed and jump on Liam, or whatever."

Liam replied: "Did it hurt a lot? That must've really hurt..."

The 29-year-old actor recently tied the knot with Miley Cyrus so Rebel joked she was very "respectful" of his new wife when they had intimate scenes to film.

Speaking at 'Build Series' in New York City, she quipped: "Liam is such a gentleman, and obviously I respect Miley [Cyrus], like, a hundred [percent], so, you know, it was all PG-13."

But the actress admitted it was a "brutal" filming experience because she is on screen so much and she tried her best not to make love scenes "awkward" by simply not thinking about them.

She said: "When we would film, we would film 16 hours a day, and it was kind of brutal, and I just had to keep going because I am in every scene of the movie.

"The scene where we're making out in the hallway -- awesome, that one -- somebody said to me, 'We only have three shirts for Liam,' so we only had three takes. So then I was like, 'OK, I'm going for it.'

"It is awkward if you think about it, but if you just go for it ... obviously our movie was PG-13, so nothing full on was going to happen."

And for Liam, he has learned to keep things "nice and light" between romantic scenes to stop things becoming uncomfortable.

He said: "It's always good in-between takes to keep it nice and light, because it's always -- when you do a kissing scene with someone that you've been working with -- now all of a sudden you have to make physical contact with their lips, that's always a little nerve-wracking.

"You're doing it in front of a lot of people, but it was really fun. We kept it light and fun."