Article continues below advertisementBarron Trump's private life has been thrust into the spotlight, as it's been revealed he developed a "very close" online relationship with a woman from London.President Donald Trump's youngest son, 19, would allegedly call and text the young lady, 22, around the clock, according to her "jealous" ex. As OK! previously reported, the unnamed woman's then-boyfriend, Russian national Matvei Rumiantsev, attacked her last January after she began referring to Barron as "sweetheart.