Ancestry We're Related Famous Kin

I have created a table containing the celebrities that Ancestry's We're Related app has told me might be kin, including the alleged shared ancestor, alleged relationship, and whether I have confirmed my half of the ancestry, disproven my half, or more research is needed. (I have no desire to spend time researching the ancestry of celebrities just to see if they share my ancestors. However, I do find it worthwhile to research my own ancestors and see if what Ancestry family trees suggest might be accurate.) 

Celebrity	Alleged Shared Ancestor	Alleged Relationship	Y/N/?
Warren Buffett	Swazey, Jospeh 1653-1717	8th Cousin 2x Removed	Y
Mark Twain	Betts, Capt. Richard 1613-1713	6th Cousin 3x Removed	Y
Johnny Depp	Betts, Capt. Richard 1613-1713	9th Cousin 2x Removed	Y
Marilyn Monroe	Burgess, Thomas 1601-1685	9th Cousin 1x Removed	?
Winston Churchill	Clark, James 1608-1674	8th Cousin, 1x Removed	?
Matt Damon	Clark, James 1608-1674	9th Cousin 1x Removed	?
Thomas Paine	Clarke, Katherine 1515-1553	7th Cousin 6x Removed	?
John Kerry	Clarke, Thomas 1570-1627	9th Cousin 1x Removed	?
Henry David Thoreau	Clarke, William 1553-1624	8th Cousin 3x Removed	?
Ronald Reagan	Constable, Thomasine 1605-1682	10th Cousin	?
Ralph Waldo Emerson	Durrant, Mary 1599-1631	6th Cousin 4x Removed	?
Bill Gates	Hinckley, Susannah 1625-1675	9th Cousin 2x Removed	?
Helen Keller	Jewell, Thomas 1608-1654	8th Cousin 3x Removed	?
Walt Disney	Kerrich, Rose 1572-1627	9th Cousin 1x Removed	?
Carrie Underwood	Lathrop, John 1584-1653	9th Cousin 2x Removed	?
Meghan Trainor	Lathrop, John 1584-1653	9th Cousin 2x Removed	?
Lady Gaga	Mapes, Thomas 1628-1687	10th Cousin	?
Benjamin Franklin	Nevill, Cecilia 1488-1573	6th Cousin 7x Removed	?
Kate Upton	Pierce, Timothy 1673-1748	8th Cousin 3x Removed	?
Kevin Bacon	Smith, Samuel 1644-1719	7th Cousin 1x Removed	?
Justin Bieber	Smith, John 1614-1710	9th Cousin 2x Removed	?
Britney Spears	Smith, John 1614-1710	9th Cousin 2x Removed	?
Abraham Lincoln	Taylor, Thomas 1574-1618	8th Cousin 2x Removed	?
Zachary Taylor	Taylor, Thomas 1574-1618	4th Cousin 6x Removed	?
Jessica Simpson	Wheldon, Gabriel 1600-1655	10th Cousin	?
Christina Aguilera	Wines, Barnabas 1600-1679	10th Cousin	?

Notes

1) All of the above alleged shared ancestors are ancestors through my maternal grandmother, Myrtle Vanevery, and all but two are ancestors through my second great grandmother, Abigail Stuart, who was the second wife of Samuel Vanevery. Timothy Pierce (my shared ancestor with Kate Upton) and Thomas Jewell (my shared ancestor with Helen Keller) are alleged ancestors of my 4th great grandmother Sarah Showers, who married David Vanevery.

2) Perhaps more interesting to me than the links that have been provided are the links that haven't yet been provided. I have long known I am related to several celebrities through my Stoughton ancestry. (Also ancestors of Abigail Stuart) The Stoughtons are in my database. But none of these celebrities have appeared. (John Kerry has, but through a different alleged shared ancestor.)

3) I'm sure I have famous kin through the lines of my other three grandparents, but the documents necessary to trace my (and their) ancestry back far enough is currently undiscovered in Eastern Europe, if not completely lost. I know of three paternal cousins with Wikipedia pages, though not quite with the name recognition of the individuals above. Two more are already mentioned several times on Wikipedia, and separate bio pages could probably be written by someone, and not be deleted.