Princess Siribhachudabhorn (Thai: ??????????????; Thai pronunciation: [sì.rì.p?a?.t?ù.t?a?.p???n]; RTGS: Siriphachuthaphon; born 8 October 1982), commonly known as Princess Ribha (Thai: ?????; IPA: [rì.p?a?.]; RTGS: Ripha), is the eldest daughter of Princess Chulabhorn Walailak and Virayudh Tishyasarin.