Diana Ross tears up as Beyoncé sings 'Happy Birthday' to her during lavish celebrations

There are very few people who wouldn't be overcome with emotion at the mere prospect of one of the world's biggest megastars singing 'Happy Birthday' to them.

And this certainly doesn't just apply to us ordinary people - even the most famous individuals in show business would get starstruck by such an honour.

As it turns out that Diana Ross, one of the biggest legends in the music industry, is one of them.

This is the moment Beyoncé sings 'Happy Birthday' to a teary-eyed Diana Ross:

Ross celebrated her 75th birthday in Los Angeles on Tuesday - and what a lavish event it was, with plenty of unforgettable highlights.

But the absolute best highlight wasn't the extravagant birthday cake, decorated with pictures of the legendary Motown musician, or even the star-studded guest list, which included the likes of Leonardo DiCaprio, Khloé and Kourtney Kardashian, Tom Ford, and Robin Thicke.

Nope, it was the truly incomparable moment that the one and only Beyoncé Knowles serenaded the 75-year-old national treasure.

The Lemonade singer emerged from a crowd full of famous faces and impressed Ross with her famously soulful voice to the extent that the iconic diva started to tear up.

Now, let's not forget that Ross was the frontwoman of the most successful girl group from the 60s, The Supremes. So it really speaks volumes that she was so moved by the vocals of her much younger counterpart.

Once the touching footage emerged, plenty of people took to Twitter to share their thoughts on it:

Of course, Ross' lavish birthday celebration isn't the only thing that people have been talking about recently.

In fact, earlier this week, she voiced her continued support for Michael Jackson in the wake of the damning child abuse allegations that have been levelled against him in the explosive two-part documentary, Leaving Neverland.

"This is what’s on my heart this morning," she wrote. "I believe and trust that Michael Jackson was and is A magnificent incredible force to me and to many others. STOP IN THE NAME OF LOVE [sic]".