Kevin Hart and a number of fellow Celebs stepped up to show their concern with donations to Houston.

Hart issued a challenge to some of his fellow celebrities to donate relief money.

The actor took to Instagram on Sunday night and shared a video where he calls on fellow A-listers to provide relief aid to the thousands of people in need. 

'Serious moment right now, I've just been caught up to speed with everything that's going on in Houston and this s*** is unbelievable,' Hart states in the video. 

'I think we've participated in a lot of challenges on the internet. Some meaningful, some meaningless, but we've all done 'em. I've been a person whose partaken in several of them. 

'At this point, I'm going to start a real challenge. I'm challenging a lot of my celebrity friends to follow my lead and donating $25,000 to Hurricane Harvey to the Red Cross

'At this point this is a serious matter. I think that people are in bad shape and they need help. I'm going to lead the charge and step up this way.' 

Hart then challenged a number of celebrities including Beyonce, Chris rock, Justin Timberlake, Steve Harvey, Dwayne 'The Rock' Johnson, Jay Z, Jerry Seinfeld and Dave Chappelle. 

'I think when you do it, you all should tag somebody else,' he added.

Donations to Hart's fundraising campaign for Harvey relief can be made by clicking here.  

The Rock quickly stepped up. The Baywatch actor said he donated $25,000 to the Red Cross.

He then shared on Monday: 'Stay strong Houston and hold onto faith. Me and my family know what you're going thru. We survived the eye of Andrew and became stronger - so will you. All my love and strength. * Link in my bio in you can donate a buck or two to our Houston families in need.'

Beyonce has not announced a donation, but that's because she prefers to be more private, her pastor told TMZ on Tuesday.  

Rev. Rudy Rasmus from St. John's United Methodist Church told the site he and the singer 'are mobilizing to help Hurricane Harvey victims.'

He added that the Crazy In Love songbird 'commonly keeps her charitable efforts undercover.' He would not confirm the rumour that she has donated $7m.

Country singer Chris Young said in a Twitter video that he created an online fundraiser for the Red Cross and donated $100,000. 

Katy Perry also urged viewers to donate while hosting the MTV's Video Music Awards on Sunday night. 

She also tweeted a link to the Red Cross' donation efforts to more than 100 million followers on Twitter.  

Hurricane Harvey has already dumped a historic 11 trillion gallons of water on Texas - with another 27 inches of rain falling so far and another 23 inches expected to come within the next few days.

Experts said the aftermath of the catastrophic hurricane could equal the level of destruction of Katrina in 2005.

The storm has claimed the lives at least five people and FEMA, the Federal Emergency Management Agency, revealed it would take the area years to recover from the storm which is the worst this decade.