Katharine McPhee

Despite the generational gap, many of these A-list pairs have gone on to welcome numerous children and defend their relationships.

Get to know Meghan Markle's closest friends within the royal family and in Hollywood.

These celebrity couples — and former twosomes — believe that age is just a number when it comes to dating.

Katharine McPhee left her concert tour in Asia to rush home for a "horrible tragedy" last week, and now we know the shocking details of what happened.

The singer was set to perform with her husband in Asia but has pulled out to deal with the personal matter.

These celebs have been accused of marrying for money.

As photos show, the honeymoon is far from over for the famous newlyweds.

See how the singer, 35, and music producer, 69, are still enjoying newlywed life!

She worries her decades-older husband’s advancing years may become an issue.

McPhee said ‘I do’ to Foster in London following two years of dating.

The actress and composer are getting married this weekend after 2 years of dating.

Couple says 'I Do' after one year of engagement.

‘Yaaaaaaaas b***h. I mean, mother,’ jokes stepdaughter-to-be Sara Foster.

McPhee and Foster look loved-up ahead of lavish wedding.

Actress is 34 years younger than her fiance.

Star will wed much older fiancé but ogles hunky young stripper at bash!

Singer/actress' past includes bulimia, a brush with Scientology, and cheating!

Hadid complains to pals Foster is 'way too old' for McPhee.

The pair's relationship is going strong despite 34 years age difference.

'Extreme vocal fatigue' hits singer as she plans wedding to much older fiance.

The Duchess of Sussex smiled alongside actress Katharine McPhee.

American Idol alum has spent a fortune on the $2 million property.

The odd couple hit Italy—where they got engaged this summer!

‘Mommy and daddy need alone time,’ the singer, 34, tells Erin Foster, 36.

She's returned to BWay and prepares for a wedding to much older David Foster!

See David Foster's much younger fiancée having a boob problem!

'My heart will ever be the same,' says Broadway actress.

McPhee willing to elope with fiancé David Foster in order to start a family fast.

She 'has a great future,' much old composer gushes on 'American Idol' in 2006!

Star who will marry composer twice her age urges haters to follow politics instead.

The breakup comes days after Foster proposed to Katharine McPhee.

The singer’s now-fiancé David Foster is exactly twice her age!

‘Mommmyyy’ commented Erin Foster, 35.

'Mommmyyy', writes one about actress, who is much younger than the composer!

See images of the newly engaged couple all over each other in public.

The producer popped the question during a European getaway.

The love birds couldn't keep their hands off each other in elegant couture.

The unlikely couple seems settled in and loved up as ever.

Inside their desperate plan to get justice.

The unlikely duo can’t get enough of each other!

McPhee is ‘desperate to stay famous,’ a pal claimed of the wannabe starlet.

The fame-hungry duo could not have looked happier under the spotlight.

Foster and the ‘Smash’ star started dating after he split from Yolanda Hadid.

Find out why the recently divorced unlikely duo are REALLY dating!

The musician's been parading his hot new conquest all over town.

The new pair can't seem to keep their hands off each other!

This is the aging musician’s latest fling since his divorce from sickly Hadid.

Has the couple already rushed down the aisle?

The sex leak caused 'horror' and 'humiliation,' star claims.

Tommy Bahama Hosts Private Event At Hyde Staples Center for Taylor Swift