The engagement was announced between Princess Isaline Lobkowicz (b.26 August 1988) [second of four children of Prince Ladislav Lobkowicz (b.1957) & his wife Anne, nee Countess de Briey (b.1964)]
& Baron Guerric de Crombrugghe de Looringhe [son of Baron Eric de Crombrugghe de Looringhe & his wife Katheline, nee Countess van Rijckevorsel]
on 11 June.
Her older sister, Princess Ludmila Lobkowicz, has just got married.
Sources:
http://www.carnetmondain.be/
http://www.angelfire.com/realm/gotha/news/2013_2.htm
Update: Lady Melissa Percy (daughter of Duke & Duchess of Northumberland) & Thomas van Straubenzee are going to marry
on 22 June.
Honourable Nicholas Knatchbull (son of Norton Knatchbull, Baron Romsey & his wife, Penelope Eastwood) & his fiancee Rahel Tedros are going to marry
in August.
Source for both:
Google Vertalen
Prince Alessandrojacopo Boncompagni Ludovisi (b.30 April 1972) [only child of late Prince Paolo Boncompagni Ludovisi (1947-2007) & his late wife, Donna Angela Maria Altemps (1942-1993)]
got engaged to Maria Carolina [dei Conti] Zucchini Metelli.
Prince Scipione Borghese, Prince Borghese (b.19 November 1970) [son of Camillo Borghese, Prince Borghese (1927-2011) & his wife Rossana, nee Nucci (1933-1981)]
is engaged to Donna Barbara Massimo dei Principi di Arsoli [daughter of late Don Filippo Massimo, Duke of Arsoli & his former wife, Maria Capparella]
His paternal first cousin, Prince Flavio Borghese, got married a month ago.
Countess Mabel von Colloredo-Mannsfeld (b.8 October 1978) [daughter of Count Franz von Colloredo-Mannsfeld (b.1938) & his wife Maria Alexandra, nee Princess von Thurn und Taxis (b.1939)
is engaged to Torsten Karth.
Mabel is the youngest of four children and last one who marries.
Source for all: as above.
Sébastien de Limon Triest [son of Donna Martina Colonna dei pincipi di Paliano (b.1953) & her husband, Bernard de Limon Triest (b.1943)]
will marry Anne-Hélia Roure (daughter of Mr and Mrs Jean-Luc Roure)
in a religious ceremony at Siena on 21 September.
Source:
http://www.angelfire.com/realm/gotha/news/2013_3.htm
Giving that the religious ceremony is mentioned, I suppose their civil wedding has already taken place.
The bridegroom has two sisters Georgina and Eleonora:
http://gw.geneanet.org/gounou?lang=fr;pz=auguste;nz=dumont;ocz=0;p=sebastien;n=de+limon+triest